diff --git a/IPA.Loader/Loader/Features/Feature.cs b/IPA.Loader/Loader/Features/Feature.cs
index df70401e..d354bb6f 100644
--- a/IPA.Loader/Loader/Features/Feature.cs
+++ b/IPA.Loader/Loader/Features/Feature.cs
@@ -1,9 +1,8 @@
-using Mono.Cecil;
+#nullable enable
 using Newtonsoft.Json.Linq;
 using System;
 using System.Collections.Generic;
-using System.Reflection;
-using System.Text;
+using System.Diagnostics.CodeAnalysis;
 #if NET3
 using Net3_Proxy;
 #endif
@@ -35,7 +34,7 @@ namespace IPA.Loader.Features
         /// This should also be set whenever either <see cref="BeforeInit"/> returns false.
         /// </summary>
         /// <value>the message to show when the feature is marked invalid</value>
-        public virtual string InvalidMessage { get; protected set; }
+        public virtual string? InvalidMessage { get; protected set; }
 
         /// <summary>
         /// Called before a plugin's `Init` method is called. This will not be called if there is no `Init` method. This should never throw an exception. An exception will abort the loading of the plugin with an error.
@@ -65,6 +64,7 @@ namespace IPA.Loader.Features
 
         // TODO: rework features to take arguments as JSON objects
 
+        [SuppressMessage("Nullability", "CS8618", Justification = "Reset sets those fields.")]
         static Feature()
         {
             Reset();
@@ -72,18 +72,18 @@ namespace IPA.Loader.Features
 
         internal static void Reset()
         {
-            featureTypes = new Dictionary<string, Type>
+            featureTypes = new()
             {
                 { "IPA.DefineFeature", typeof(DefineFeature) }
             };
-            featureDelcarers = new Dictionary<string, PluginMetadata>
+            featureDelcarers = new()
             {
                 { "IPA.DefineFeature", null }
             };
         }
 
         private static Dictionary<string, Type> featureTypes;
-        private static Dictionary<string, PluginMetadata> featureDelcarers;
+        private static Dictionary<string, PluginMetadata?> featureDelcarers;
 
         internal static bool HasFeature(string name) => featureTypes.ContainsKey(name);
 
@@ -123,7 +123,7 @@ namespace IPA.Loader.Features
             }
         }
 
-        internal string FeatureName;
+        internal string FeatureName = null!;
 
         internal class Instance
         {
@@ -139,8 +139,8 @@ namespace IPA.Loader.Features
                 type = null;
             }
 
-            private Type type;
-            public bool TryGetDefiningPlugin(out PluginMetadata plugin)
+            private Type? type;
+            public bool TryGetDefiningPlugin(out PluginMetadata? plugin)
             {
                 return featureDelcarers.TryGetValue(Name, out plugin);
             }
@@ -173,101 +173,5 @@ namespace IPA.Loader.Features
                 return result;
             }
         }
-
-        /*
-        // returns false with both outs null for no such feature
-        internal static bool TryParseFeature(string featureString, PluginMetadata plugin,
-            out Feature feature, out Exception failException, out bool featureValid, out Instance parsed,
-            Instance? preParsed = null)
-        {
-            failException = null;
-            feature = null;
-            featureValid = false;
-
-            if (preParsed == null)
-            {
-                var builder = new StringBuilder();
-                string name = null;
-                var parameters = new List<string>();
-
-                bool escape = false;
-                int parens = 0;
-                bool removeWhitespace = true;
-                foreach (var chr in featureString)
-                {
-                    if (escape)
-                    {
-                        builder.Append(chr);
-                        escape = false;
-                    }
-                    else
-                    {
-                        switch (chr)
-                        {
-                            case '\\':
-                                escape = true;
-                                break;
-                            case '(':
-                                parens++;
-                                if (parens != 1) goto default;
-                                removeWhitespace = true;
-                                name = builder.ToString();
-                                builder.Clear();
-                                break;
-                            case ')':
-                                parens--;
-                                if (parens != 0) goto default;
-                                goto case ',';
-                            case ',':
-                                if (parens > 1) goto default;
-                                parameters.Add(builder.ToString());
-                                builder.Clear();
-                                removeWhitespace = true;
-                                break;
-                            default:
-                                if (removeWhitespace && !char.IsWhiteSpace(chr))
-                                    removeWhitespace = false;
-                                if (!removeWhitespace)
-                                    builder.Append(chr);
-                                break;
-                        }
-                    }
-                }
-
-                if (name == null)
-                    name = builder.ToString();
-
-                parsed = new Instance(name, parameters.ToArray());
-
-                if (parens != 0)
-                {
-                    failException = new Exception("Malformed feature definition");
-                    return false;
-                }
-            }
-            else
-                parsed = preParsed.Value;
-
-            if (!featureTypes.TryGetValue(parsed.Name, out var featureType))
-                return false;
-
-            try
-            {
-                if (!(Activator.CreateInstance(featureType) is Feature aFeature))
-                {
-                    failException = new InvalidCastException("Feature type not a subtype of Feature");
-                    return false;
-                }
-
-                featureValid = aFeature.Initialize(plugin, TODO);
-                feature = aFeature;
-                return true;
-            }
-            catch (Exception e)
-            {
-                failException = e;
-                return false;
-            }
-        }*/
     }
 }
\ No newline at end of file
diff --git a/IPA.Loader/Loader/PluginLoader.cs b/IPA.Loader/Loader/PluginLoader.cs
index 679b4bb9..bab9cfba 100644
--- a/IPA.Loader/Loader/PluginLoader.cs
+++ b/IPA.Loader/Loader/PluginLoader.cs
@@ -1,4 +1,5 @@
-using IPA.Config;
+#nullable enable
+using IPA.Config;
 using IPA.Loader.Features;
 using IPA.Logging;
 using IPA.Utilities;
@@ -32,7 +33,7 @@ namespace IPA.Loader
 
     internal partial class PluginLoader
     {
-        internal static PluginMetadata SelfMeta;
+        internal static PluginMetadata SelfMeta = null!;
 
         internal static Task LoadTask() =>
             TaskEx.Run(() =>
@@ -40,6 +41,9 @@ namespace IPA.Loader
             YeetIfNeeded();
 
             LoadMetadata();
+
+            // old loader system
+#if false
             Resolve();
             InitFeatures();
             ComputeLoadOrder();
@@ -47,6 +51,7 @@ namespace IPA.Loader
             FilterWithoutFiles();
 
             ResolveDependencies();
+#endif
         });
 
         internal static void YeetIfNeeded()
@@ -68,10 +73,10 @@ namespace IPA.Loader
             }
         }
 
-        internal static List<PluginMetadata> PluginsMetadata = new List<PluginMetadata>();
-        internal static List<PluginMetadata> DisabledPlugins = new List<PluginMetadata>();
+        internal static List<PluginMetadata> PluginsMetadata = new();
+        internal static List<PluginMetadata> DisabledPlugins = new();
 
-        private static readonly Regex embeddedTextDescriptionPattern = new Regex(@"#!\[(.+)\]", RegexOptions.Compiled | RegexOptions.Singleline);
+        private static readonly Regex embeddedTextDescriptionPattern = new(@"#!\[(.+)\]", RegexOptions.Compiled | RegexOptions.Singleline);
 
         internal static void LoadMetadata()
         {
@@ -130,7 +135,7 @@ namespace IPA.Loader
                     foreach (var resource in pluginModule.Resources)
                     {
                         const string manifestSuffix = ".manifest.json";
-                        if (!(resource is EmbeddedResource embedded) ||
+                        if (resource is not EmbeddedResource embedded ||
                             !embedded.Name.EndsWith(manifestSuffix)) continue;
 
                         pluginNs = embedded.Name.Substring(0, embedded.Name.Length - manifestSuffix.Length);
@@ -297,6 +302,7 @@ namespace IPA.Loader
         }
     }
 
+    #region Ignore stuff
     /// <summary>
     /// An enum that represents several categories of ignore reasons that the loader may encounter.
     /// </summary>
@@ -372,15 +378,15 @@ namespace IPA.Loader
         /// Gets the textual description of the particular ignore reason. This will typically
         /// include details about why the plugin was ignored, if it is present.
         /// </summary>
-        public string ReasonText { get; internal set; }
+        public string? ReasonText { get; internal set; }
         /// <summary>
         /// Gets the <see cref="Exception"/> that caused this plugin to be ignored, if any.
         /// </summary>
-        public Exception Error { get; internal set; }
+        public Exception? Error { get; internal set; }
         /// <summary>
         /// Gets the metadata of the plugin that this ignore was related to, if any.
         /// </summary>
-        public PluginMetadata RelatedTo { get; internal set; }
+        public PluginMetadata? RelatedTo { get; internal set; }
         /// <summary>
         /// Initializes an <see cref="IgnoreReason"/> with the provided data.
         /// </summary>
@@ -388,7 +394,7 @@ namespace IPA.Loader
         /// <param name="reasonText">the textual description of this ignore reason, if any</param>
         /// <param name="error">the <see cref="Exception"/> that caused this <see cref="IgnoreReason"/>, if any</param>
         /// <param name="relatedTo">the <see cref="PluginMetadata"/> this reason is related to, if any</param>
-        public IgnoreReason(Reason reason, string reasonText = null, Exception error = null, PluginMetadata relatedTo = null)
+        public IgnoreReason(Reason reason, string? reasonText = null, Exception? error = null, PluginMetadata? relatedTo = null)
         {
             Reason = reason;
             ReasonText = reasonText;
@@ -412,10 +418,10 @@ namespace IPA.Loader
         public override int GetHashCode()
         {
             int hashCode = 778404373;
-            hashCode = hashCode * -1521134295 + Reason.GetHashCode();
-            hashCode = hashCode * -1521134295 + EqualityComparer<string>.Default.GetHashCode(ReasonText);
-            hashCode = hashCode * -1521134295 + EqualityComparer<Exception>.Default.GetHashCode(Error);
-            hashCode = hashCode * -1521134295 + EqualityComparer<PluginMetadata>.Default.GetHashCode(RelatedTo);
+            hashCode = (hashCode * -1521134295) + Reason.GetHashCode();
+            hashCode = (hashCode * -1521134295) + ReasonText?.GetHashCode() ?? 0;
+            hashCode = (hashCode * -1521134295) + Error?.GetHashCode() ?? 0;
+            hashCode = (hashCode * -1521134295) + RelatedTo?.GetHashCode() ?? 0;
             return hashCode;
         }
 
@@ -437,13 +443,15 @@ namespace IPA.Loader
         public static bool operator !=(IgnoreReason left, IgnoreReason right)
             => !(left == right);
     }
+    #endregion
 
     internal partial class PluginLoader
     {
         // keep track of these for the updater; it should still be able to update mods not loaded
         // the thing -> the reason
-        internal static Dictionary<PluginMetadata, IgnoreReason> ignoredPlugins = new Dictionary<PluginMetadata, IgnoreReason>();
+        internal static Dictionary<PluginMetadata, IgnoreReason> ignoredPlugins = new();
 
+#if false
         internal static void Resolve()
         { // resolves duplicates and conflicts, etc
             PluginsMetadata.Sort((a, b) => b.Version.CompareTo(a.Version));
@@ -706,6 +714,7 @@ namespace IPA.Loader
             DisabledConfig.Instance.Changed();
             PluginsMetadata = metadata;
         }
+#endif
 
         internal static void InitFeatures()
         {
@@ -726,7 +735,7 @@ namespace IPA.Loader
                     }
                     else
                     { // this is literally any other feature, so we want to delay its initialization
-                        meta.UnloadedFeatures.Add(feature);
+                        _ = meta.UnloadedFeatures.Add(feature);
                     }
                 }
             }
@@ -740,10 +749,13 @@ namespace IPA.Loader
                     {
                         if (plugin != meta)
                         { // if the feature is not applied to the defining feature
-                            meta.LoadsAfter.Add(plugin);
+                            _ = meta.LoadsAfter.Add(plugin);
                         }
 
-                        plugin.CreateFeaturesWhenLoaded.Add(feature);
+                        if (plugin != null)
+                        {
+                            plugin.CreateFeaturesWhenLoaded.Add(feature);
+                        }
                     }
                     else
                     {
@@ -776,11 +788,11 @@ namespace IPA.Loader
 
         internal static void Load(PluginMetadata meta)
         {
-            if (meta.Assembly == null && meta.PluginType != null)
+            if (meta is { Assembly: null, PluginType: not null })
                 meta.Assembly = Assembly.LoadFrom(meta.File.FullName);
         }
 
-        internal static PluginExecutor InitPlugin(PluginMetadata meta, IEnumerable<PluginMetadata> alreadyLoaded)
+        internal static PluginExecutor? InitPlugin(PluginMetadata meta, IEnumerable<PluginMetadata> alreadyLoaded)
         {
             if (meta.Manifest.GameVersion != UnityGame.GameVersion)
                 Logger.loader.Warn($"Mod {meta.Name} developed for game version {meta.Manifest.GameVersion}, so it may not work properly.");
@@ -870,7 +882,7 @@ namespace IPA.Loader
                 else
                 {
                     feature.AppliedTo.InternalFeatures.Add(inst);
-                    feature.AppliedTo.UnloadedFeatures.Remove(feature);
+                    _ = feature.AppliedTo.UnloadedFeatures.Remove(feature);
                 }
             }
             meta.CreateFeaturesWhenLoaded.Clear(); // if a plugin is loaded twice, for the moment, we don't want to create the feature twice
@@ -905,7 +917,7 @@ namespace IPA.Loader
                     if (exec != null)
                     {
                         list.Add(exec);
-                        loaded.Add(meta);
+                        _ = loaded.Add(meta);
                     }
                 }
                 catch (Exception e)
diff --git a/IPA.Loader/Utilities/EnumerableExtensions.cs b/IPA.Loader/Utilities/EnumerableExtensions.cs
index fa2978dc..bf74bc63 100644
--- a/IPA.Loader/Utilities/EnumerableExtensions.cs
+++ b/IPA.Loader/Utilities/EnumerableExtensions.cs
@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
@@ -33,7 +34,7 @@ namespace IPA.Utilities
                 this.first = first;
             }
 
-            public PrependEnumerator GetEnumerator() => new PrependEnumerator(this);
+            public PrependEnumerator GetEnumerator() => new(this);
 
             public struct PrependEnumerator : IEnumerator<T>
             {
@@ -45,12 +46,12 @@ namespace IPA.Utilities
                     this.enumerable = enumerable;
                     restEnum = enumerable.rest.GetEnumerator();
                     state = 0;
-                    Current = default;
+                    Current = default!;
                 }
 
                 public T Current { get; private set; }
 
-                object IEnumerator.Current => Current;
+                object? IEnumerator.Current => Current;
 
                 public void Dispose() => restEnum.Dispose();
 
@@ -109,7 +110,7 @@ namespace IPA.Utilities
                 this.last = last;
             }
 
-            public AppendEnumerator GetEnumerator() => new AppendEnumerator(this);
+            public AppendEnumerator GetEnumerator() => new(this);
 
             public struct AppendEnumerator : IEnumerator<T>
             {
@@ -121,12 +122,12 @@ namespace IPA.Utilities
                     this.enumerable = enumerable;
                     restEnum = enumerable.rest.GetEnumerator();
                     state = 0;
-                    Current = default;
+                    Current = default!;
                 }
 
                 public T Current { get; private set; }
 
-                object IEnumerator.Current => Current;
+                object? IEnumerator.Current => Current;
 
                 public void Dispose() => restEnum.Dispose();
 
@@ -170,8 +171,8 @@ namespace IPA.Utilities
         /// <typeparam name="T">the type of the enumeration</typeparam>
         /// <param name="self">the enumeration to filter</param>
         /// <returns>a filtered enumerable</returns>
-        public static IEnumerable<T> NonNull<T>(this IEnumerable<T> self) where T : class
-            => self.Where(o => o != null);
+        public static IEnumerable<T> NonNull<T>(this IEnumerable<T?> self) where T : class
+            => self.Where(o => o != null)!;
 
         /// <summary>
         /// LINQ-style extension method that filters <see langword="null"/> elements out of an enumeration based on a converter.
@@ -181,7 +182,7 @@ namespace IPA.Utilities
         /// <param name="self">the enumeration to filter</param>
         /// <param name="pred">the predicate to select for filtering</param>
         /// <returns>a filtered enumerable</returns>
-        public static IEnumerable<T> NonNull<T, U>(this IEnumerable<T> self, Func<T, U> pred) where U : class
+        public static IEnumerable<T> NonNull<T, U>(this IEnumerable<T> self, Func<T, U?> pred) where U : class
             => self.Where(o => pred(o) != null);
 
         /// <summary>
@@ -191,7 +192,7 @@ namespace IPA.Utilities
         /// <param name="self">the enumeration to filter</param>
         /// <returns>a filtered enumerable</returns>
         public static IEnumerable<T> NonNull<T>(this IEnumerable<T?> self) where T : struct
-            => self.Where(o => o != null).Select(o => o.Value);
+            => self.Where(o => o != null).Select(o => o!.Value);
 
         /// <summary>
         /// LINQ-style extension method that filters <see langword="null"/> elements out of an enumeration based on a converter to a nullable type.