The Zruty is a rather peculiar monster native to
NetHack. To the best of my knowledge, it was
incorporated in order to have a
monster that actually started with "Z", since the various "
Zombie" monsters were classed by their previous existance (I.E.
Elf Zombie).
The Zruty is of
neutral alignment and appeases your god by 1 point when
sacrificed. It is level 10 and has 44
hit points and an
armor class of 3. There is nothing particularly
special about it, and it is described as a large, non-descript
quadroped.
It is a rather embarassing experience to be killed by a
zruty, largely due to the history behind their existance.