Complementary question:
when shapeshifted to primal form, will you keep your stats, or will some of them be buffed (bear would gain more +X str, +X con and -X dex ) or will all the stats be changed to "default bear shape stats" independent to stats of humanoid form (like in ADaD with druid shapeshifting) ? I hope for first option,or second one to balance passives of demons (Maybe i understood it wrong, but are nightmare´s bonuses during night/in dark conditions and hellfire´s dmg reduction upon reaching X% of life passive abilities ? If so, they would have advantage of one free ability slot for more damage or defensive ability, wouldn´t they...unless the change into bear makes him significantly better than in humanoid form in full plate and with huge 2h weapon --> seems to me that for caster the shapeshift into bear will be "panic button" if melee gets too close, but will it have any positives for tanky 2H bear? Bear warriors for example might find passive ability of more toughness and self heal upon reaching some endurance threshold more usable - just like Hellfire´s "fiery veins resist" passive ability...same for deer kin - maybe passive movespeed on X% of hp, would do the same). One free slot in game with 8 slots might change a lot.
Concerning bear -kin - does regen bonus of bear primal form increase with more constitution? And does bonus regeneration gained on reaching natural 20 in constitution also improve further up to 25 con?