Wintermist
Chieftain
Yvain doesn't have sorcery, so he cant cast Vitalize, the Nature III Sorcery spell.
Yvain does have Life I.
This is intended.
(although I would prefer it if he were also given Sorcery, while still having the life sphere. Alao, life magic would make more sense for Druids, since they are the ones "infused with the magic of Sucellus", the former god of nature/current god of life, while Yvain is the "Favorite son of Cernunnos", the new nature god.)
So he's not supposed to be able to cast Bloom either?