Cultist: Unique and interesting ability, but pretty underpowered. Doesn't
have enough creature control as it is?
Cerberus: Lovely mechanic, but the ability is laughable. A <100% percentage divided by ten is going to be a tiny number less than 1. Reword it and it may get my vote.
Snail: Interesting and fun mechanic, but I don't really see... how it fits. A Lava Snail? It doesn't make much sense in anything (besides Pokemon), let alone Elements. A close third.
Stallion: To me, the weakest link in the awesomeMount series. It doesn't really make sense (like the Snail) and it has very limited usage.
Cauterize: Great. It's very powerful, but expensive and surely not overpowered. And the Advanced Spells series must continue!
Spontaneous: An interesting pillar-based mechanic and awesome art. 2 things led to me not voting for it: 1) Its similarity to Fire Bolt, 2) The fact that it consumes all
quanta, making it similar to Cauterize, forcing me to choose between the two
Tempest: Pretty underpowered and not very interesting. With a buff, it may see some action, though.
Ward: Ah, this was what I was looking for! It's a pretty perfect mechanic, and one I've been wanting for a long time. Great art, great ability, great balance. First.
Brazier: Like most other things in the series, it's complicated and... just strange. I can see its uses but it just seems too much for Elements to handle at this point.
Lava: It's interesting and all, but like Brazier, it's too sudden, too soon. We need to ease our way into area effects, like through Mortar.
Thus: vote for Cauterize and Fire Ward!