At the very beginning of the Dungeon of Eternal Life, there is a Troll in the cell. You can get him out of there. Unfortunately, this does not work with the elemental Trolls. Get Deep Blue out there, and spray the Troll with water. This will get the Troll up. You can then become a puddle thing and use the whirlpool to bring him closer. If you get too close to the bars, the whirlpool will suck him up and he will die before you can have your fun. When he is close enough to the bars so that you can grab him, do so and he will be free. However, he will still just stand there, glitched. You can torture and play around with the troll, but you cannot take him outside with you. If you kill him, just go back outside then return to see a fresh Troll to destroy.