Duskwalker Lore Feat 1
Source Pathfinder Advanced Player's Guide
You either found another duskwalker who taught you the secrets of your kind, or you managed to research your unusual heritage. You gain the trained proficiency rank in Medicine and Religion. If you would automatically become trained in one of those skills (from your background or class, for example), you instead become trained in a skill of your choice. You also become trained in Boneyard Lore.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
DuskwalkerA creature with this trait has the duskwalker versatile heritage. Duskwalkers are planar scions infused with the supernatural energy of psychopomps. An ability with this trait can be used or selected only by duskwalkers.