The Derp Knife

Description
The Derp Knife is the most powerful and famous weapon in the multiverse. Forged by DerpyMcDerpell himself, the powerful weapon can do nearly anything, especially within the Derpy Dimension and some other dimensions. DerpyMcDerpell always keeps it with him, and he can also summon it if it is lost, which is a useful feature because DerpyMcDerpell basically loses everything every single second.