continuity/Content/BossOverrides.cs

using System;
using System.Linq;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;
using Terraria.GameContent.ItemDropRules;
using Continuity.Content.Items;

namespace Continuity.Content
{
    public class PlanteraDrops : GlobalNPC
    {
        public override void ModifyNPCLoot(NPC npc, NPCLoot npcLoot)
        {
            if (npc.type == NPCID.Plantera) 
            {
                npcLoot.Add(ItemDropRule.Common(ModContent.ItemType<PalishadeTissue>(), 1, 25, 35));
            }
        }
    }

    public class PlanteraBossBag : GlobalItem
    {
        public override void ModifyItemLoot(Item item, ItemLoot itemLoot)
        {
            if (item.type == ItemID.PlanteraBossBag)
            {
                short[] toRemove = {
                    ItemID.TheAxe,
                    ItemID.PygmyStaff,
                    ItemID.Seedling,
                    ItemID.ThornHook,
                };
                foreach (var i in toRemove)
                {
                    itemLoot.RemoveWhere(rule => rule is CommonDropNotScalingWithLuck drop
                        && drop.itemId == i);
                }
                itemLoot.RemoveWhere(rule => rule is CommonDrop drop
                    && drop.itemId == ItemID.TempleKey);

                foreach (var rule in itemLoot.Get())
                {
                    itemLoot.RemoveWhere(rule => rule is OneFromRulesRule);
				        }
            }
        }
    }
}