Squashed commit of the following:

commit ef803b0
Author: VALERA771 <72030575+VALERA771@users.noreply.github.com>
Date:   Mon Nov 13 05:57:25 2023 +0300

    New effects (#2224)

    * new effect

    * same as flashlight?

    * Revert "same as flashlight?"

    This reverts commit ffa76c7.

    * new effects

    * typo fix

    * xml update

    * fix

    * forgor

    * Update Exiled.API/Enums/EffectType.cs

    Co-authored-by: Thunder <thundermaker300@gmail.com>

    * Update Exiled.API/Extensions/EffectTypeExtension.cs

    Co-authored-by: Thunder <thundermaker300@gmail.com>

    * Update Exiled.API/Enums/EffectType.cs

    Co-authored-by: Thunder <thundermaker300@gmail.com>

    * basically what Yamato is saying is

    * Update Exiled.API/Enums/EffectType.cs

    * Update Exiled.API/Enums/EffectType.cs

    * Add using statement

    ---------

    Co-authored-by: Yamato <66829532+louis1706@users.noreply.github.com>
    Co-authored-by: Thunder <thundermaker300@gmail.com>
    Co-authored-by: Misaka-ZeroTwo <45165615+Misaka-ZeroTwo@users.noreply.github.com>

Exiled.API/Enums/EffectType.cs

@@ -7,6 +7,8 @@
 
 namespace Exiled.API.Enums
 {
+    using System;
+
     using Exiled.API.Extensions;
 
     /// <summary>
@@ -199,5 +201,26 @@ public enum EffectType
         /// Teleports the player to the pocket dimension and drains health until the player escapes or is killed. The amount of damage recieved increases the longer the effect is applied.
         /// </summary>
         PocketCorroding,
+
+        /// <summary>
+        /// Reduces walking sound by 10%.
+        /// </summary>
+        SilentWalk,
+
+        /// <summary>
+        /// Makes you a marshmallow guy.
+        /// </summary>
+        [Obsolete("Not functional in-game")]
+        Marshmallow,
+
+        /// <summary>
+        /// The effect that is given to the player when getting attacked by SCP-3114's Strangle ability.
+        /// </summary>
+        Strangled,
+
+        /// <summary>
+        /// Makes the player nearly invisible, and allows them to pass through doors.
+        /// </summary>
+        Ghostly,
     }
 }

Exiled.API/Extensions/EffectTypeExtension.cs

@@ -12,11 +12,9 @@ namespace Exiled.API.Extensions
     using System.Linq;
 
     using CustomPlayerEffects;
-
     using Enums;
-
+    using InventorySystem.Items.MarshmallowMan;
     using InventorySystem.Items.Usables.Scp244.Hypothermia;
-
     using PlayerRoles.FirstPersonControl;
 
     /// <summary>
@@ -66,6 +64,10 @@ public static class EffectTypeExtension
             { EffectType.Traumatized, typeof(Traumatized) },
             { EffectType.AntiScp207, typeof(AntiScp207) },
             { EffectType.Scanned, typeof(Scanned) },
+            { EffectType.SilentWalk, typeof(SilentWalk) },
+            { EffectType.Marshmallow, typeof(MarshmallowEffect) },
+            { EffectType.Strangled, typeof(Strangled) },
+            { EffectType.Ghostly, typeof(Ghostly) },
         };
 
         /// <summary>