Spicy Pigman Sword. One of the best weapons in the game!
Currently with 3 Hot Potato Books increasing damage to +206 and Strength to +111.
An additional 7 Hot Potato Books can be added, with potential to increase damage to +220 and Strength to +125.
With +130% Crit Damage, you will be one-tapping Zealots and farming summoning eyes like a boss. Think of this as an investment.
16 good enchantments and Lightning Rune III (level 19 rune).