Benefit: Choose one ability. You ignore penalties from ability damage to that ability until you have taken an amount of ability damage equal to your score in that ability.
Somehow, there has to be a way to abuse this particular feat. Its absurd. Self-inflicted ability damage remover, like ignoring Alchemist Mutagen penalties or Blood Money costs.
What do you think? Anything crazier than ignoring Blood Money's only penalty?
Handy for an alchemist who uses cognatogens, if they can afford Wis 15. For one who likes the standard mutagen it's not so useful. Lion's Heart ignores penalties from ability damage rather than straight penalties to abilities and yes those are different.
A ninja using the redirect force trick would like this for the times when the enemy has a poison bite or something. Again, Wis 15 is a problem. Maybe a rogue taking that ninja trick would like it better.
There's probably something the contact high spell can use which this can affect.
So blood money is by far the biggest thing this feat can affect IMO.
sadly, I dont think it works with blood money due to the feat working vs Ability Penalty not Ability Damage.
By this same reasoning it would work with mutagen but not cognatogen.
I does seem like a great way to deal with a large portion of anti-ability spells.
Lion's Heart doesn't let you use Blood Money any additional times, but it does let you completely ignore the penalty until you would have reached 0. Normally the risk with Blood Money is that you suffer encumbrance penalties out the wazoo (and yes, any GM worth their salt will track your encumbrance like its their goddamn taxes if you are playing a Blood Money Wizard). However, if you happen to be a Wizard with this feat instead you can keep on carrying your full weight in gear even with str damage.
Also, in addition to AVR's suggestions I've found the Volcano Oracle Mystery has an ability that lets you take Con damage from Volcanic Vapors to boost your Charisma...not sure how easily you might find Volcanic Vapors but its still cool.
EDIT: Another cool thing you can do, Fiend Flayer Magus can ignore their Constitution damage from using their Blood to augment their Arcane Pool along with the Padzhar alchemical remedy to accelerate healing.
Also lets you freely use Borrowed Time to boost your swift actions as a caster.