HealthyFoesBonus.cs

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using System;
using Loot.Api.Attributes;
using Loot.Api.Core;
using Loot.Api.Delegators;
using Loot.Modifiers.Base;
using Terraria;

namespace Loot.Modifiers.EquipModifiers.Offensive
{
    public class HealthyFoesEffect : ModifierEffect
    {
        public float Multiplier;

        public override void OnInitialize()
        {
            Multiplier = 1f;
        }

        public override void ResetEffects()
        {
            Multiplier = 1f;
        }

        [AutoDelegation("OnModifyHitNPC")]
        [DelegationPrioritization(DelegationPrioritization.Late, 998)]
        public void ModifyHitNPC(Item item, NPC target, ref int damage, ref float knockback, ref bool crit)
        {
            if (target.life == target.lifeMax)
            {
                HealthyFoes(ref damage);
            }
        }

        [AutoDelegation("OnModifyHitPvp")]
        [DelegationPrioritization(DelegationPrioritization.Late, 998)]
        private void ModifyHitPvp(Item item, Player target, ref int damage, ref bool crit)
        {
            if (target.statLife == target.statLifeMax2)
            {
                HealthyFoes(ref damage);
            }
        }

        private void HealthyFoes(ref int damage)
        {
            damage = (int) (Math.Ceiling(damage * Multiplier));
        }
    }

    [UsesEffect(typeof(HealthyFoesEffect))]
    public class HealthyFoesBonus : EquipModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower}% damage vs max life foes");
        }

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

        public override void UpdateEquip(Item item, Player player)
        {
            ModifierDelegatorPlayer.GetPlayer(player).GetEffect<HealthyFoesEffect>().Multiplier += Properties.RoundedPower / 100f;
        }
    }
}