A recluse who has left his haven with a high tech gun and two plasmids to purge Rapture
Analyzes fights first and decided wheter it'd be worth trying to save his enemies or not then plunges into the fight with his superior wepaons to a crackpots weapon. Helps Big Daddies protect the little sisters and when a Big Daddy dies, he takes the little sister and runs to find a Big Daddy who has no Little Sister or a vent if needed. Rarely harvests them as he gets his adam from scavanging and dead bodies
Weapons: Taleth refused to use the crude weapons most used to get by after the civil war and so barricading a small area, he began work where no one disturbed him, and any curious splicer was annihilated by the many turrents he had set up. After years of refinemnet, he managed to make a real weapon and enough ammo to go along with it. He had imported weapon plans from the surface before coming to rapture and corrected flaws making a FAMAS, the French bullpup rifles standard with GIGN.
Plasmids: Also while working with his weapons, he had been playing around with plasmids and to create his own, a poison gas plasmid where he releases some gas that kills splicers by the dozens, but usless against anyone who has a gasmask or a big daddy, big sister, etc. Furthermore, he has to wear a mask himself when using it as he could die from exposure to it also.
A young child during the civil war, his parents managed to get him back to the surface as all hell broke loose and a couple years after Jack's adventure, he located Rapture and with stolen weapon blueprints, he decneded into hell and secluded himself for several years and observed Subject Delta's ramage through Rapture and with the Familly out of the picture, less splicers attacked and he was able to finish both plasmids and his weapon and remerged saving anyone he deemed worthy, even splicers.