CursedDamage.cs

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using System.Linq;
using Loot.Api.Attributes;
using Loot.Api.Core;
using Loot.Api.Ext;
using Loot.Modifiers.Base;
using Terraria;
using Terraria.ID;

namespace Loot.Modifiers.WeaponModifiers
{
    public class CursedEffect : ModifierEffect
    {
        public int CurseCount;

        public override void ResetEffects()
        {
            CurseCount = 0;
        }

        // There are two ways to delegate your method,
        // you can either specify by enum (safest) like here
        // or by string (see below)
        [AutoDelegation(DelegationTarget.PostUpdateEquips)]
        private void CurseHolding()
        {
            Item checkItem = Main.mouseItem != null && !Main.mouseItem.IsAir ? Main.mouseItem : player.HeldItem;

            if (checkItem == null || checkItem.IsAir || !checkItem.IsWeapon()
                || !LootModItem.GetInfo(checkItem).IsActivated)
                return;

            int c = LootModItem.GetActivePool(checkItem).Count(x => x.GetType() == typeof(CursedDamage));
            if (c > 0)
            {
                DelegatorPlayer.GetEffect<CursedEffect>().CurseCount += c;
            }
        }

        // The alternative way is providing the target name yourself
        // in the form of a string. It can be preceded by "On"
        // but it may also be left out.
        [AutoDelegation("OnUpdateBadLifeRegen")]
        private void Curse()
        {
            if (CurseCount <= 0 || player.buffImmune[BuffID.Cursed])
                return;

            if (player.lifeRegen > 0)
            {
                player.lifeRegen = 0;
            }

            player.lifeRegen -= 2 * CurseCount;
            player.lifeRegenTime = 0;
        }
    }

    [UsesEffect(typeof(CursedEffect))]
    public class CursedDamage : WeaponModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower}% damage, but you are cursed while holding this item");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMinMagnitude(5f)
                .WithMaxMagnitude(15f)
                .IsUniqueModifier(true);
        }

        public override bool CanRoll(ModifierContext ctx)
        {
            return base.CanRoll(ctx) && ctx.Method != ModifierContextMethod.SetupStartInventory;
        }

        public override void ModifyWeaponDamage(Item item, Player player, ref float add, ref float mult, ref float flat)
        {
            base.ModifyWeaponDamage(item, player, ref add, ref mult, ref flat);
            add += Properties.RoundedPower / 100f;
        }
    }
}