Type: General
Source: Fiendish Codex II
Behind Mephistopheles's mask of civility and quick wit burns the fire of frustration and hatred. You acquire this archdevil's temperament, and you can channel it to destroy your foes.
Prerequisite: Brand of the Nine Hells, allegiance to Mephistopheles.
Benefit: The passionate anger for which Mephistopheles is famed burns brightly in you. Each round when you miss on an attack roll or a target successfully saves against a spell, spell-like ability, or supernatural ability you have cast or used, you gain a cumulative +1 bonus on attack rolls, damage rolls, saves, and checks. This bonus lasts until you successfully hit a target or until a target fails a saving throw against one of your spells, spell-like abilities, or supernatural effects.
For every +1 bonus you gain, you also take a -1 penalty to Armor Class. This penalty disappears when the bonus no longer applies.