Lightslayer Oath Feat 2
Source Pathfinder Advanced Player's Guide
Prerequisites tenets of evil
You've sworn to rid the world of the self - righteousness of celestial beings. Add the following tenet to your code, after the other tenets. "You must banish or slay celestials you encounter as long as you have a reasonable chance of success; in the incredibly unlikely event you find an evil celestial, you don't have to banish or kill it."
When you use your champion's reaction against a celestial, the extra damage you deal with Strikes increases by 1 (or by 2 at 9th level and by 3 at 16th level).
Traits
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
ChampionThis indicates abilities from the champion class.
OathOaths add an additional tenet to your code. You can usually have only one feat with this trait.