Halaster Blackcloak

The Mad Wizard Halastar Blackcloak is a very old and very eccentric mage who resides within his lair, a deep, dark dungeon known as Undermountain. Within this dungeon, Halaster tests any adventurer who wanders in, usually until they die. This mad mage laughs at most of what he says, but despite his constant laughing, he is as sharp as a tack and can finish an opponent in an instant. His memory is long and is slow to forget misdeeds against him as well as those who may stumble upon him in need of aid. Halaster Blackcloak's favorite pasttime, other than toying with adventurers within his realm, is finding new beasts and monsters from around Toril and the planes to bring to his lair using a set of modified conjuration spells that he has created expressly for this purpose.

Forgotten Realms Campaign Setting, Ed Greenwood, Reynolds, Williams, Heinsoo; 2001 Wizards of the Coast