Tales of the Valiant Players Guide (pg. 77)
Agile Form.
The spirit has a climbing speed equal to its walking speed and has advantage on saves to avoid being knocked prone.
Aquatic Form.
The spirit has a swimming speed equal to its walking speed and can hold its breath for up to 20 minutes.
Avian Form.
The spirit has a flying speed equal to its walking speed. Carrying a heavy load or creature of its size or larger while flying reduces its speed by half.
Sturdy Form.
The spirit has a natural AC 13 + your PB. In addition, the creature counts as one size larger when determining its carrying capacity and the weight it can push or drag.
Multiattack.
The spirit makes a number of attacks equal to half your PB (rounded down).
Natural Weapons.
Melee Weapon Attack: +4 + your PB to hit, reach 5 ft., one target. Hit: 8 + your PB (1d8 + 4 + your PB) damage. You decide whether this attack deals bludgeoning, piercing, or slashing damage when you choose the spirit’s form.