Move Creation Workshop

[Summer]

That DOES look fun :yay:
Anycase, because this is a Super Defense that doesn't injure anyone, I think Area Attack won't be needed because the whole "freezes the surroundings" is fluff. However, I would include that the "surprise winter" is fluff, into the actual move (if I understand correctly, everything after "[...] normalize again." is no longer part of the move description).

Also, ten seconds of complete immobility followed by five seconds during which Somerled is relatively vulnerable are a lot of disadvantages for a Super Defense. This is my personal opinion (I think the move could be approved as it is once you include the fluff) but having him be able to freeze himself in a few seconds, then staying in that frosted state until he takes a T1 Super Attack's worth of damage OR for 10 seconds at most, whichever is shorter, and finally thawing over, say 2 seconds, would be more than enough. Otherwise an opponent could "break" Somerled's defense with a T1 Super Attack and go ham on him for the remainder of the 10-15 seconds
Since you're spending SP on this you can give yourself a little more breathing room, I say.

T1 Super Defense: Cold Snap (Area Shield) (600): The chill of winter rapidly wells up from Somerled’s very core, swelling up in a frozen blast. Over the course of a few seconds, the spirit freezes up from the inside, his entire body quickly icing through, essentially becoming a humanoid chunk of frozen meat, rigid and stuck in whatever unfortunate pose he happened to freeze in. This cold snap spreads out even past his body, bringing a sudden and early frost to the world around. Though freezing over does prevent him from moving or thinking, having such a solid form also protects him from a decent amount of damage until he defrosts. The thaw begins either ten seconds after the initial freeze, or after he's tanked a Tier 1 Super worth of damage, and takes about two seconds until he'd completely deiced. During this warming period he is still vulnerable, unable to move and quickly returning to his normal squishiness. Even though this attack does bring an early winter, if only for a short time until the climate rights itself again, it's basically just cold air and a bit of frost, having no effect outside of disturbing the weather.

ALRIGHT
The fluff is now properly fluffy, the thaw time has been reduced, and is now set off after either 10 seconds have passed or someone hits him hard enough.