Undead. Turin carries a dagger of venom that instantly discards allies of +4 or less. He is immune to unarmed combat cards and the special powers of all Forgotten Realms champions.
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TSR
Wizards of the Coast
Allies of +4 or less icon level may be played against Turin, though they are immediately discarded without their powers ever activating. Turin's immunity to the special powers of Forgotten Realms champions applies even if that power is being copied by a non-Forgotten Realms champion and used against Turin. Thus if Rhuobhe Manslayer (14/BR-chase) attacks and copies the power of the Living Wall (58/PO), Turin Deathstalker can still defend and would be unaffected by the instant defeat power. Don't forget that immunities are always in effect, even when in the pool.
Turin packs quite load of special powers aimed at combat. No allies under level 5 and immunity to powerful cards like Fighting Dirty! (3/DU-chase) and the Living Wall cause this champion to be a favorite in Greyhawk world decks. You can also find Turin in many standard tournament decks due to the added popularity of Con Game (82/DU) and Hijacking (86/DU). Undead combat decks are another good place to put Turin Deathstalker.
Turin is a good choice to lead an attack with. His immunities negate many powerful combat cards and will often lead your opponent to just throw up a handy champion to die hoping you will attack again with a champion not so immune.