5d4 x Vigor Modifier. Then add HP bonus. Short Rest =Vigor Mod x15. Long Rest Vigor Mod + Primary mod x20.
HP bonuses | Natural AR Bonus
LV 1 25 |+5
LV 2 15 |+2
LV3 10 |+1
LV 4 10 |+1
LV 5 d10 |+1
LV 10 d10
LV 20 d10
LV 25 d10
LV 30 d10