Ventura's page

It might be an oversight when the creature was made since Avsheros is a fallen planetar, and normal planetars have "regeneration (deactivated by evil)".

Since a lot of Avsheros' abilities have been flipped to the opposite to fit a fallen celestial, I would personally change it to (deactivated by good) if I know my players have some way of doing good damage.

Otherwise you could remove Avsheros' "Blasphemous Arms" ability and just make it an unholy weapon (and then maybe remove equal gp loot elsewhere) and then the PC can only deal the killing blow to Avsheros by his own greatsword. While a good PC is enfeebled 2 while wielding an unholy weapon, a unconscious/dying creature gets -6 AC, so it balances out.

I second Ograx's comment about Tanessas oddly low AC and saving throws, and I think there might be something wrong with Ginjana Mindkeepers saving throws as well (her AC is fine).

Right now Ginjanas highest save is +18 Reflex, which for a lvl 11 creature is in the "low" category according to the building creatures rules, and her other saves being below "terrible". As her dex modifier is +7 (con and wis +3 each), her current saving throws seem more fitting if she was a lvl 7 creature. :)