Fawkes' Super Sledge

Fawkes' Super Sledge is a Super Sledge equipped by Fawkes while escaping Vault 87 with him. To obtain it, kill him or accept him as an ally and trade equipment with him. If you choose to take it, Fawkes is equipped with a normal sledgehammer. You may also pickpocket one from him. (She appears to have two in her inventory when pickpocketing.)