As far as I know, he's the only Elder Dragon who allows mortal followers to willingly pledge themselves to him (which is strange when they can just Corrupt you, willing or not). Likewise his "gifts" are very similar to those of the Ruinous Powers of Warhammer: they are very powerful, but very dangerous to the giftee as well. Those who are unworthy or otherwise incapable of handling them will "mutate" into horrible abominations* (Chaos Spawn in Warhammer, Icebrood in GW2) while those worthy/powerful enough to handle it are greatly rewarded (such as the high-ranking Svanir like the HoTWs bosses who are sort of akin to Champions of Chaos).
*Seriously, take a look at the Icebrood Colossus model. A real close look. Utter body horror, that.
Anyone else spotted this similarity?
Please Anet give us a hide Chest Armour-option. Tattoo-clad Norns everywhere beg of you.