From Brotato Wiki

Whetstone.png
Whetstone
Item
Tier 2
Stats
+4% Life Steal
-3 Knockback
Price
40
Unlocked by
Win a run with Sick.png Sick

Item

Whetstone is an in-game item that can be bought from a Shop or can be found in a Crate. Most Items modify the Stats of the player, and some of them provide additional effects.