Gray Boon

At 2nd level and every 2 levels thereafter, a Gray Corsair gains some of the class features of the class he chose as his gray focus, provided he has at least 1 level in the class chosen.

If his gray focus class is bard, cleric, inquisitor, magus, mesmerist, psychic, sorcerer, or wizard, he gains spells per day as if he’d gained an additional level of the class chosen. If his gray focus class is fighter, gunslinger, or swashbuckler, he gains a bonus combat feat.

If his gray focus class is investigator, he gains a +1d6 studied strike, as per the investigator class feature. This extra damage stacks with other sources of studied strike. If his gray focus class is rogue, he gains a +1d6 sneak attack, as per the rogue class feature. This extra damage stacks with other sources of sneak attack damage.