Level 3
Hearts Fuel.
+5 max HP. Upgrade your Hit Dice to d10s.
Water of Life.
(1/ encounter) Add + WIL HP to a spell or potion that heal.
Level 7
Stream of Life.
(1/ day) Increment Dice for spells that heal for 1 minute.
Level 11
Vital Knack.
(1/ day) 1 action. Your next healing potion or spell has maximum effectiveness.
Level 15
Lifegiving Torrent.
(1/ day) 1 action. Copy the last healing spell and select new targets for the copy.