Vessel's Form 
Feat 16
Source Pathfinder Dark Archive
Prerequisites Living Vessel Dedication
Frequency once per day
You symbiotically combine your form with that of the entity within you, taking a powerful hybrid form to temporarily boost your abilities in combat while maintaining control. For 1 minute, you gain the following effects.
- If you were Medium or smaller, you become Large, and your reach increases to 10 feet.
- You gain a +2 status bonus to attack and damage rolls and a +1 status bonus on saving throws against spells. If you use Entity's Resurgence, the status bonuses to attack and damage rolls increase to +3 during the time that the two effects overlap.
- If you have the Entity's Strike feat, the unarmed attack you gained from that feat increases its damage die from 1d6 to 1d8.
- You gain 40 temporary Hit Points.
- You gain a fly Speed equal to your Speed.
Special This action has the tradition trait appropriate to your entity, typically divine for a demon, occult for an aberration or outer entity, or primal for a fey.
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.
ArchetypeThis feat belongs to an archetype.
ConcentrateAn action with this trait requires a degree of mental concentration and discipline.
PolymorphThese effects transform the target into a new form. A target can't be under the effect of more than one polymorph effect at a time. If it comes under the effect of a second polymorph effect, the second polymorph effect attempts to counteract the first. If it succeeds, it takes effect, and if it fails, the spell has no effect on that target. Any Strikes specifically granted by a polymorph effect are magical. Unless otherwise stated, polymorph spells don't allow the target to take on the appearance of a specific individual creature, but rather just a generic creature of a general type or ancestry. If you take on a battle form with a polymorph spell, the special statistics can be adjusted only by circumstance bonuses, status bonuses, and penalties. Unless otherwise noted, the battle form prevents you from casting spells, speaking, and using most manipulate actions that require hands. (If there's doubt about whether you can use an action, the GM decides.) Your gear is absorbed into you; the constant abilities of your gear still function, but you can't activate any items.
TransmutationEffects and magic items with this trait are associated with the transmutation school of magic, typically changing something's form.