This is the official monster spoiler for Martin's Dungeon Bash, version 1.4.
Stupid: Stupid monsters move randomly when they cannot see you.
Smart: Smart monsters have some ability to find you when they aren't in the same room as you. Monsters that are neither stupid nor smart have a (very) limited ability to pursue you if they were adjacent to you when you left their vision zone.
Ethereal: Ethereal monsters ignore terrain. There is only one ethereal monster at present, the wraith.
Undead: Undead monsters are immune to the effects of vampire rings, and cannot be harmed by other monsters' ranged necromantic attacks.
Resists cold: Monsters which resist cold are immune to the effects of frost rings and other monsters' ranged cold attacks.
Resists fire: Monsters which resist fire are immune to the effects of fire rings and other monsters' ranged fire attacks.
Archer: Archers are monsters which have ranged attacks not derived from the practice of black magic.
Magician: Magicians are monsters which practice black magic.