From the NannyMUD documentation

LAST CHANGE

2000-12-08

COMMAND

NAME
        zap - Kill a monster.


LOCATION
	Wizmod, module 'default'.

SYNTAX
	zap [target]

DESCRIPTION
	With no argument, zaps your current attacker. With an argument, zaps
	that target. This means dealing 10000 points of damage to the target,
	without taking armour into account.


NOTE
	If you are a PK, you can kill players that are PK with this. Don't do
	that; remove your PK status to make sure you don't zap mortals.