A human is a very rare monster — it is never randomly generated or placed in a normal game. They can be created by zapping a wand of undead turning at a human corpse, found in graveyards and by casting stone to flesh on human statues. Human corpses left by human zombies will not create human monsters when zapped by the wand, returning rather to their zombie form. A human monster can also be created by reverse genocide, if the player is human.
Encyclopedia entry Edit
These strange creatures live mostly on the surface of the
earth, gathering together in societies of various forms, but
occasionally a stray will descend into the depths and commit
mayhem among the dungeon residents who, naturally, often
resent the intrusion of such beasts. They are capable of
using weapons and magic, and it is even rumored that the
Wizard of Yendor is a member of this species.