The well runs deep
Level 3
Fortification.
+5 max HP. Upgrade your Hit Dice to d12.
Seeing Red.
While you are Bloodied, reduce all damage taken by STR. This does not affect HP costs for Bloodletter abilities.
Level 7
Undying Bulwark.
(1/encounter) If you would drop to 0 HP, drop to 1 HP instead.
Level 11
Unshakeable.
You count as one size larger for the purpose of Knockbacks. You cannot be Slowed, and ignore the effects of difficult terrain.
Level 15
Impenetrable.
(1/encounter) When you Defend, take no damage from that attack. This ability refreshes after using a Crimson Rite.