And as I read over your lore and search for certain parts. The lore is flawed heavily and shows little to no understanding of how pacts work.
“The Lutauman, seen as a bridge between the Mortal and Ancestral Realm, is capable of conversing with any ancestral spirit - including the greater ones. Much like Elementalists, the shaman can create a pact or swear an oath to a greater ancestral spirit. That they may do something for the spirit in question in return for their blessing when most convenient. There is, however, not always need for such a pact - as you already know. The Stargush’Stroh is filled with the spirits of fallen honourable orcs and few other descendants, meaning that one such spirit, in their previous life, used to be the shaman’s friend or family.”
This is a passage pulled directly from the lore above. I’m too lazy to quote it, you can double check if you wish. This single line stands out to me when reading over it and here is why.
"That they may do something for the spirit in question in return for their blessing when most convenient. “
Firstly, if a Shaman’s only purpose is to get something back from the Spirit, they would never achieve it. A Spirit isn’t a being that will take a favor and exchange it with the Lutuaman or any Shaman at any time the Shaman wants it.
Moving on towards the Summoning of Kor. Not only is Kor a spirit of Death which every Shaman is blacklisted from interacting with that you have chosen to ignore the lore and make your own orc immortal from a pact with Kor, interacting with the Eight Forbidden Spirits is not allowed because it’s game breaking. You wrote Kor into a ‘Master’ Ancesteral Spirit. Lutaumans can’t interact with Elementals or Immortal Spirits, they are strictly locked in with Ancesteral Spirits which Kor is not labelled as or is an Ancesteral Spirit.
I’m getting lunch soon so just writing up a few rough notes here for you. This lore is heavily flawed and breaks many strict rules of Lutuamancy and Shamanism as a whole.