KnockbackImmunity.cs

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

namespace Loot.Modifiers.EquipModifiers.Defensive
{
    public class KnockbackImmunity : EquipModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"Knockback immunity");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithRollChance(0.333f)
                .WithRarityLevel(3f)
                .IsUniqueModifier(true);
        }

        public override bool CanRoll(ModifierContext ctx)
        {
            // Don't roll on items that already provide knockback immunity
            switch (ctx.Item.type)
            {
                default:
                    return base.CanRoll(ctx);
                case (ItemID.CobaltShield):
                case (ItemID.ObsidianShield):
                case (ItemID.AnkhShield):
                    return false;
            }
        }

        public override void UpdateEquip(Item item, Player player)
        {
            player.noKnockback = true;
        }
    }
}