In Legacy of Kain lore as it stands, Hash'ak'gik isn't really a character, he's a fabricated god invented by the Hylden to control humans and bring down the Pillars. Technically he's Turel, but not a god or anything of the sort. Turel was posing as a god under Hylden duress. Silicon Knights had their own ideas about Hash'ak'gik, but those are long since obsolete.
The smart thing about this retcon, to me, is that in BO1, there was a quote attributed to Hash which went "bring me your first born, and shed their blood upon the altar of the world". Who else in this story shed the blood of their first born on the altar of the world? Kain, when he condemned Raziel. Who was the executioner? Turel.