ManaShield.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;
using Terraria.DataStructures;

namespace Loot.Modifiers.EquipModifiers.Defensive
{
    public class ManaShieldEffect : ModifierEffect
    {
        public float ManaShield; // % of damage redirected to mana

        public override void ResetEffects()
        {
            ManaShield = 0f;
        }

        [AutoDelegation("OnPreHurt")]
        [DelegationPrioritization(DelegationPrioritization.Late, 100)]
        private bool ManaBlock(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)
        {
            // If we have a mana shield (% damage redirected to mana)
            // Then try to redirect the damage
            int manaBlock = (int) Math.Ceiling(damage * ManaShield) * 2;
            if (manaBlock > 0 && player.statMana > 0)
            {
                // We cannot block more than how much mana we have
                if (manaBlock > player.statMana)
                {
                    manaBlock = player.statMana;
                }

                damage -= manaBlock / 2;
                player.statMana -= manaBlock;
                player.manaRegenDelay = Math.Max(player.manaRegenDelay, 120);
            }

            return true;
        }
    }

    [UsesEffect(typeof(ManaShieldEffect))]
    public class ManaShield : EquipModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower}% of damage taken is redirected to mana");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMaxMagnitude(5f)
                .WithRollChance(0.75f);
        }

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