Svein:
To grow spirits, defeat attribute monsters to acquire XP of the dominating attribute.
Where are attribute monsters, you ask?
Wind Attack Hunting Ground: Wind Plateau
Earth Attack Hunting Ground: Wall of Argos
Water Attack Hunting Ground: Garden of Eva
Fire Attack Hunting Ground: Fore of the Gods
And the spirits you can grow at each hunting ground vary, so keep that in mind when selecting.Wind Attack Hunting Ground: Obtained Fire Attack XPEarth Attack Hunting Ground: Obtained Wind Attack XPWater Attack Hunting Ground: Obtained Earth Attack XPFire Attack Hunting Ground: Obtained Water Attack XP