Jubei'Thos, a fel orc blademaster, took up leadership of the Blackrock clanorcs in Lordaeron during the Third War. Jubei'Thos didn't join Thrall when he made the new Horde, because of his devotion to the Burning Legion and acceptance of Warlocks in his Clan.
This gives Jubei´thos magic resistance, similar to the resistance that level 6+ creeps have. Namely, you can't be Polymorphed, Possessed, etc, and all offensive spells have a shorter duration on the target (such as stuns, Ensnare, etc). It DOES NOT reduce damage dealt to the target, however. That’s an effect of hero armor, not hero magic resistance.
Gives Demi-heroes increased resistance to spell damage.