Restore health:
If you are in the middle of a battle and are low on health, press L2 or R2. Your 
health will be replenished by your Baku. However, it will take away as many 
Esamons as you need hearts.

Unlockable: Baku Shield:
Unlock Tumble’s Baku Shield by collecting 100 Dream Energies. The first two 
portals in the temple of dreams must be unlocked.