Kill

Command: kill
Syntax: kill [<monster> | list]
This command is used to initiate combat with the monster you specify. (or
just type 'kill monster' and you will attack any NPC beings in the same
room.) Once combat begins you may only end it by running away or if one of
you dies. Other players may also be attacked.

NOTE:
Use 'kill list' to view what monsters you have killed recently. You will
learn less if you kill continuously the same kind of monsters.