master

Content.Client/_White/Cult/HellComponent.cs

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+using Content.Shared._White.Cult.Pentagram;
+using Robust.Shared.GameStates;
+
+namespace Content.Client._White.Cult;
+
+[NetworkedComponent, RegisterComponent]
+public sealed partial class HellComponent : SharedHellComponent;

Content.Client/_White/Cult/HellSystem.cs

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+using System.Numerics;
+using Robust.Client.GameObjects;
+using Robust.Shared.Utility;
+
+namespace Content.Client._White.Cult;
+
+public sealed class HellSystem : EntitySystem
+{
+    private const string Rsi = "White/Cult/hell.rsi";
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<HellComponent, ComponentStartup>(PentagramAdded);
+        SubscribeLocalEvent<HellComponent, ComponentShutdown>(PentagramRemoved);
+    }
+
+    private void PentagramAdded(EntityUid uid, HellComponent component, ComponentStartup args)
+    {
+        if (!TryComp<SpriteComponent>(uid, out var sprite))
+            return;
+
+        if (sprite.LayerMapTryGet(HellKey.Key, out _))
+            return;
+
+        var adj = sprite.Bounds.Height / 2 + 1.0f/32 * 6.0f;
+
+        var layer = sprite.AddLayer(new SpriteSpecifier.Rsi(new ResPath(Rsi), "animated"));
+
+        sprite.LayerMapSet(HellKey.Key, layer);
+        sprite.LayerSetOffset(layer, new Vector2(0.0f, adj));
+        sprite.LayerSetShader(layer, "unshaded");
+    }
+
+    private void PentagramRemoved(EntityUid uid, HellComponent component, ComponentShutdown args)
+    {
+        if (!TryComp<SpriteComponent>(uid, out var sprite))
+            return;
+
+        if (!sprite.LayerMapTryGet(HellKey.Key, out var layer))
+            return;
+
+        sprite.RemoveLayer(layer);
+    }
+
+    private enum HellKey
+    {
+        Key
+    }
+}