The catoblepas in a monster added in SLASH'EM. It possesses a fatal gaze attack that will kill you immediately if you are not undead, blind, magic resistant, or reflecting. There is a 75% chance that the gaze will miss plus another 66% if you are either invisible or displaced. If you are reflecting and the gaze would have connected, then it will kill the gazer. Although the catoblepas is not randomly generated, it is a valid polymorphable form, so it is perfectly possible for a chameleon or intelligent monster with a wand of polymorph or polymorph trap to suddenly turn into a cateblepas. It is also possible to self polymorph into a catoblepas, but beware of monsters with reflection, as it is perfectly possible to kill yourself by your own reflected gaze.