Athame

The Athame is a small silver ritual dagger. It is highly ineffective when used against normal mobs, but it boasts a huge damage bonus against Endermen. The Athame is capable of killing an Enderman in just two non-critical hits. Its item ID is 1329.

Crafting requires a single Silver Ingot and a Stick, which means it can be crafted without the need for a Crafting Table.

An Athame can be enchanted with Disjunction to cause even more damage to Endermen.