ManaReduce.cs

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

namespace Loot.Modifiers.WeaponModifiers
{
    public class ManaReduce : WeaponModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"-{Properties.RoundedPower}% mana cost");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMaxMagnitude(10f);
        }

        public override bool CanRoll(ModifierContext ctx)
            => base.CanRoll(ctx) && ctx.Item.mana > 0;

        public override void Apply(Item item)
        {
            base.Apply(item);
            // Always reduce by at least 1 mana cost
            item.mana = (int) Math.Floor(item.mana * (1 - Properties.RoundedPower / 100f));

            // Don't go below 1 mana cost! 0 cost is too OP :P
            if (item.mana < 1)
            {
                item.mana = 1;
            }
        }
    }
}