Hakkar
The story of Zul’Gurub and the return of Hakkar, the real Blood God
G'huun is a johnny-come-lately.
The Corrupted Blood Plague spreads to Hearthstone
The Blood God Hakkar has come to spread his plague amongst all the players in Hearthstone.
Know Your Lore: The mysterious absence of Hakkar the Soulflayer
In an expansion that deals heavily with the Loa, one is particularly conspicuous in his absence.