The Root Of All Evil

The Root Of All Evil is a Legendary Weapon, arguably the best Yoyo in terraria, and a War Mode, Post-Oof Spirit item. It is one of the best yoyos in the game but is extremely hard to craft, as it requires 250 Oofium Coins, which are coins above Platinum.

Crafting
The Root Of All Evil is really expensive, and can only be purchased after My Dad is defeated, but it is arguably the best yoyo in Terraria.