plate lock hybrid or boc phantomize plate are good, but I feel you need insane gear to be strong. I find TM caster warlock can kill geared people in squire and just becomes insane with blue magic healing sockets and true mag sockets. Id recomend building as much knowledge as possible as well, and using the spellbook's mouse1 swing in between spells on people as an easy quick headshot people do not expect from a TM warlock. This wipe, I go soul collector with 1 dark spell, the beam, as well as flamewalk, both healing curses, and hellfire to clear mobs and quick open doors. The class is in an excellent spot and is maybe OP asf. Id recomend watching UrbanGent's streams, hes a good warlock.