uncommon druid polymorph transmutation 

Cast [>>] somatic, verbal

Range 30 feet; Targets 1 animal companion in your service

Duration 1 minute

You focus on the energies of all members of your animal companion's species, transforming your animal companion into its apex battle form. Your animal companion gains the following statistics and abilities while in its apex form.

• Your animal companion becomes Huge and its attacks have 15-foot reach. It must have enough space to expand into or the spell is lost.
• 30 temporary Hit Points.
• Darkvision.
• Your animal companion's attack's damage dice increase by one step, and its attack gains the deadly d12 trait.
• +10-foot status bonus to its Speeds.
• Ignores difficult terrain and greater difficult terrain.

Age of Ashes #6: Broken Promises, page 77.