Twin Sage Full Moon

Legends say that a pair of sages, of sorcery and wizardry made this together to cement a friendship. Now though, it is the signature spell of the head mage of Raya Lucaria Seldena. She rose to the top with this spell, charming the other high mages with her full moon. This in turn gave birth to a new crown, Lazuli. 

This spell launches forth a full moon which takes up a 5ft sphere. The full moon gives off dim light for 30ft and bright for 5ft.

It moves 20ft a round in a direction which the caster decides. If a creature comes in contact with the full moon it triggers dealing 5d10 cold damage vs a dexterity save. Save or fail they become vulnerable to force damage till the beginning of the casters next turn.