Part of Destiny: Nimble
Level 3
Devour.
While at 0 HP, Spectral Blast heals you equal to the damage dealt.
Walking the Line.
When you lose the Dying condition, your Spectral Form lasts until the end of that turn, allowing you to still use Dying only features.
Level 7
Desecrate.
While dying, you can touch an adjacent creature that died this encounter (provided its body is still there) to decompose it and heal equal to 2 rolls of your hit die.
Level 11
Soul Eater.
When you reduce a creature to 0 hp, heal up to your LVL (can’t heal if HP is higher than LVL, but this effect takes precedence over Devour).
Level 15
Banished from Death.
(1/turn) When Walking the Line is active, use a Spectral Form ability for -1 action.