My drakon is level 22. I have not spent a single skill point so far, because I want it specifically for 1 skill. I am having trouble deciding that one skill.
The fireball is a bit weak and I am a gunner, which reduces its use even further
The barrier is extremely useful only for status levels
Lastly I do not even know if firestorm is even worth investing into.
So a few things about me and my playstyle..
I am a gunslinger that enjoys charge shots
I suck at evasion, and excel better then most at dying
I also like to speed run a lot, trying to avoid enemies by just running through them.
So which drakon skills to focus on..?
Only ultimates that appeal to me is the backfire barrier (or whatever that increases run speed) and both firestorms... (sounds interesting, but spiral knights has a habit of over exaggeration in their description)
You are going to get enough skill points to max all of your skills way before you get to level 90 (where you can choose your first ultimate), so which one you choose to max first really doesn't matter very much. Based on your description, however, I would start with flame barrier--remember that it grants a def boost in addition to the orbs/chance to cause fire.