Lion Tamer Trophy
Defeat the Living Creature.
After you beat the Warlock, you will arrive in a limbo type of place that is black and white. From here you can select which entrance you would like to enter the Abyss from, choose the second entrance and hope that he appears. His appearance is random but most common in the 2nd entrance, this enemy is very hard for under levelled characters. Use whatever tactics work best for you here.