The following information pertains to an upcoming version (NetHack 3.7). If this version is now released, please verify that it is still accurate, then update the page to incorporate this information.Hezrous now leave poisonous stinking clouds as they move.
Like any major demon outside of the balrog and foocubus, the hezrou can summon other demons when attacking, and is eligible for gating; polymorphing into a hezrou and attacking a monster with bare or gloved hands grants a 1⁄13 chance per hit landed to summon other tame demons. ("Some hell-p has arrived!")
Hezrou are not particularly threatening by the time they are generated, due to their slow speed and relatively paltry damage; however, a monster polymorphed into a hezrou by a trap fairly early in the dungeon can be a deadly threat. Unlike other demons, however, the hezrou's lack of speed makes it easier for you to avoid, and it shares the usual demonic weaknesses to cold and silver.
If you find yourself polymorphed into a hezrou as the result of a trap, destroying your body armor, gating in some pet hezrou can serve as a means of defense until you find replacement armor.
"Hezrou" is the common name for the type II demon. It is
among the weaker of demons, but still quite formidable,
mostly due to the stench.