When you drop to zero hit points, you cast Fireball centered on yourself. The level that the spell is cast is determined by a formula.
To determine spell level: player level /2 -1 rounded up with a minimum of 3.
If you are immune to the damage form the Fireball spell for any reason, or if fireball is unable to be cast due to an antimagic field or other obstruction, this feat does nothing.
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