Deathlocks were undead spellcasters bound to serve a master. They were usually the remains of warlocks, reanimated by their patrons after failing to fulfill their part of a pact, but could also be created by necromancers.
Some deathlocks, known as deathlock masterminds, were granted more freedom and power, as they were also charged with recruiting and commanding others to serve their patrons' goals.
Other deathlocks, as a form of punishment by certain types of patrons or certain necromancers, were transformed into husks of their former selves, halfway between a warlock and a wight. Known as deathlock wights, these miserable creatures could drain the lives of any living creature nearby.
Deathlocks did not have any goals that they had in life, aside from fulfilling their patron's desires.
Deathlocks had access to some of the spells of their living counterparts. The spells of a deathlock depended on its patron in life. Masterminds counted on a larger variety of spells, as well as being able to fire necrotic grave bolts. Deathlock wights, on the other hand, had barely any spells remaining.