ImmunityTimePlus.cs

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

namespace Loot.Modifiers.EquipModifiers.Defensive
{
    public class ImmunityEffect : ModifierEffect
    {
        public int BonusImmunityTime; // Extra immunity frames

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

        [AutoDelegation("OnPostHurt")]
        [DelegationPrioritization(DelegationPrioritization.Late, 800)]
        private void Immunity(bool pvp, bool quiet, double damage, int hitDirection, bool crit)
        {
            int frames = damage <= 1
                ? BonusImmunityTime / 2
                : BonusImmunityTime;
            if (player.immuneTime > 0)
            {
                player.immuneTime += frames;
            }
        }
    }

    [UsesEffect(typeof(ImmunityEffect))]
    public class ImmunityTimePlus : EquipModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower} immunity frames");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMaxMagnitude(3f)
                .WithRollChance(0.222f);
        }

        public override void UpdateEquip(Item item, Player player)
        {
            ModifierDelegatorPlayer.GetPlayer(player).GetEffect<ImmunityEffect>().BonusImmunityTime += (int) Properties.RoundedPower;
        }
    }
}