You transform into a Medium flying animal battle form with new attacks and temporary Hit Points.
Concentrate
Manipulate
Polymorph
Rank
4
Traditions
Arcane, Primal
Traits
Concentrate, Manipulate, Polymorph
Cast
2 actions
Duration
1 minute
You transform into a Medium flying animal battle form with new attacks and temporary Hit Points.
Heightened
5th
Your battle form is Large and your fly Speed gains a +10-foot status bonus. You instead gain 10 temporary HP, attack modifier +18, damage bonus +8, and Acrobatics +20.
6th
Your battle form is Huge, your fly Speed gains a +15-foot status bonus, and your attacks have 10-foot reach. You instead gain AC = 21 + your level, 15 temporary HP, attack modifier +21, damage bonus +4 and double damage dice (including persistent damage), and Acrobatics +23.
Source: Pathfinder Player Core, p. 314
Bring Aerial Form into a Pathfinder 2e game with The DM Screen.