Excel is an Eclipse Caste.
She just always uses her anima power to swear oaths she can not possibly fulfill. Like "I will never possibly never almost certainly never ever fail to be the best person that Ilpallazzo has ever seen and have him jump inot my arms!" Then, when she breaks the oath (pretty much the next second) she is cursed to catostrohic botches on her critcal rolls.
That or she knows Defeat From the Jaw of Victory Prana.
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Epsilon
She just always uses her anima power to swear oaths she can not possibly fulfill. Like "I will never possibly never almost certainly never ever fail to be the best person that Ilpallazzo has ever seen and have him jump inot my arms!" Then, when she breaks the oath (pretty much the next second) she is cursed to catostrohic botches on her critcal rolls.
That or she knows Defeat From the Jaw of Victory Prana.
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Epsilon