ForgottenWawiTech/Content/Rarities/SingularityItem.cs

using Terraria.ModLoader;
using Terraria;
using Microsoft.Xna.Framework;
using System;

namespace ForgottenWawiTech.Content.Rarities
{
    public class SingularityItem : ModRarity
    {
        // 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;
            }
        }
    }
}