ChallengeRunesPlayer.cs

using Microsoft.Xna.Framework;
using Terraria;
using Terraria.DataStructures;
using Terraria.ID;
using Terraria.ModLoader;

namespace ChallengeRunes
{
	public class ChallengeRunesPlayer : ModPlayer
	{
        public override bool PreHurt(bool pvp, bool quiet, ref int damage, ref int hitDirection, ref bool crit, ref bool customDamage, ref bool playSound, ref bool genGore, ref PlayerDeathReason damageSource)
        {
            bool armageddon = ChallengeRunes.CheckRune(player, "armageddon");
            bool defiled = ChallengeRunes.CheckRune(player, "defiled");
            if (armageddon)
            {
                foreach (NPC npc in Main.npc)
                {
                    if (npc.boss && npc.active)
                    {
                        PlayerDeathReason armageddonDeath = PlayerDeathReason.ByCustomReason(player.name + " failed Armageddon.");
                        Main.PlaySound(SoundID.NPCDeath59.WithVolume(0.5f), player.Center);
                        player.KillMe(armageddonDeath, 1.0, 0, false);
                        ChallengeRunes.RemoveRune(player, "armageddon");
                    }
                }
            }
            if (defiled && damageSource.SourceNPCIndex > 0)
            {
                damage *= 2;
            }
            return base.PreHurt(pvp, quiet, ref damage, ref hitDirection, ref crit, ref customDamage, ref playSound, ref genGore, ref damageSource);
        }

        public override void PostUpdateBuffs()
        {
            if(ChallengeRunes.CheckRune(player, "frozen"))
                player.allDamageMult *= 0.5f;
            if(ChallengeRunes.CheckRune(player, "scorched"))
            {
                player.lifeRegen = 0;
            }
            EmitDusts();
        }

        public void EmitDusts()
        {
            if (ChallengeRunes.CheckRune(player, "armageddon"))
            {
                if (Main.rand.Next(0, 15) == 0)
                {
                    Dust.NewDust(player.Center, 5, 5, 264, -0.5f, 0, 0, new Color(255, 0, 255), 1f);
                }
            }
            if (ChallengeRunes.CheckRune(player, "defiled"))
            {
                if (Main.rand.Next(0, 15) == 0)
                {
                    Dust.NewDust(player.Center, 5, 5, 264, -0.25f, 0, 0, new Color(0, 255, 0), 1f);
                }
            }
            if (ChallengeRunes.CheckRune(player, "frozen"))
            {
                if (Main.rand.Next(0, 15) == 0)
                {
                    Dust.NewDust(player.Center, 5, 5, 264, 0.25f, 0, 0, new Color(135, 245, 255), 1f);
                }
            }
            if (ChallengeRunes.CheckRune(player, "scorched"))
            {
                if (Main.rand.Next(0, 15) == 0)
                {
                    Dust.NewDust(player.Center, 5, 5, 264, 0.5f, 0, 0, new Color(255, 150, 55), 1f);
                }
            }
        }
    }
}