Crest of Flames

When you first pick this feat you gain its first level. Whenever you reach an ability score improvement or train for a number of hours determined by the DM you gain a "level" in this feat. At first level in this feat whenever you score a critical hit on an enemy you gain a number of hit points equal to your character level. At second level the health bonus you gain is doubled, and any allies within 15 feet of you gain temporary hit points equal to your proficiency bonus. At third level whenever you score a critical hit, you immediately gain a spell slot of the lowest available level.