Add sprites for RGBass, NeptuneSummon (Megaladon), RGBAlloy, and add animations to rarities

Content/Rarities/SingularityItem.cs

@@ -1,11 +1,40 @@
 using Terraria.ModLoader;
 using Terraria;
 using Microsoft.Xna.Framework;
+using System;
 
 namespace ForgottenWawiTech.Content.Rarities
 {
     public class SingularityItem : ModRarity
     {
-        public override Color RarityColor => new Color(140, 0, 128); // Dark reddish-purple color
+        // Fade between very dark purple and bright purple (avoids unreadable black)
+        // with periodic brightness pulses for a "singularity" feel.
+        public override Color RarityColor
+        {
+            get
+            {
+                float time = Main.GlobalTimeWrappedHourly;
+
+                // Base fade (slow): very dark purple <-> bright purple
+                const float fadeHz = 0.5f; // cycles per second
+                float fadeT = (float)((Math.Sin(time * fadeHz * MathHelper.TwoPi) + 1f) * 0.5f); // 0..1
+                // Keep a minimum fade so text stays readable
+                const float minFade = 0.25f; // never dip below 25% toward bright
+                fadeT = minFade + (1f - minFade) * fadeT; // remap to [minFade, 1]
+
+                Color veryDarkPurple = new Color(50, 0, 80);
+                Color brightPurple = new Color(160, 0, 255);
+                Color baseColor = Color.Lerp(veryDarkPurple, brightPurple, fadeT);
+
+                // Pulse (quick, narrow peaks). Using a powered sine to make sharp flashes.
+                const float pulseHz = 1.2f; // pulses per second
+                float s = (float)Math.Sin(time * pulseHz * MathHelper.TwoPi);
+                float pulse = (float)Math.Pow(Math.Max(0f, s), 3f); // 0..1, narrow peaks
+                float brightness = 1f + 0.25f * pulse; // up to +25% brightness at pulse peak
+
+                // Multiply to apply brightness pulse. Color*float clamps components safely.
+                return baseColor * brightness;
+            }
+        }
     }
 }