ForgottenWawiTech/Content/Items/Accessories/EssenceOfClutches.cs

using System;
using System.Linq;
using Terraria;
using Terraria.ModLoader;
using ForgottenWawiTech.Content.Rarities;

namespace ForgottenWawiTech.Content.Items.Accessories
{
    public class EssenceOfClutches : ModItem
    {
        public override void SetDefaults()
        {
            Item.width = 28;
            Item.height = 28;
            Item.accessory = true;
            Item.rare = ModContent.RarityType<FWTDeveloperItem>();
            Item.value = Item.sellPrice(platinum: 90);
        }

        public override void UpdateAccessory(Player player, bool hideVisual)
        {
            // The more players have died during a boss, the more damage you both deal and take (up to a maximum of +50% damage dealt and +50% damage taken).
            
            // Count the number of dead players during a boss fight
            int deadPlayerCount = 0;
            if (Main.npc.Any(npc => npc.active && npc.boss))
            {
                for (int i = 0; i < Main.maxPlayers; i++)
                {
                    Player otherPlayer = Main.player[i];
                    if (otherPlayer.active && otherPlayer.dead)
                    {
                        deadPlayerCount++;
                    }
                }
            }
            
            // Each dead player grants +10% damage dealt and +10% damage taken, capped at 5 dead players (50%)
            float damageBonus = Math.Min(deadPlayerCount * 0.10f, 0.50f);
            
            if (damageBonus > 0)
            {
                player.GetDamage(DamageClass.Generic) += damageBonus;
                player.endurance -= damageBonus; // Negative endurance means taking more damage
            }
        }
    }
}