Sorceress Power Fantasy (New or Reworked Unique, Ascendancy Skill, or Gem)

Flying Spellcasters are always cool and I wish we had that.

I imagine a cooler looking Comet-like skill but with better animation and utility than the typical big damage and rather uninspired look and feel. What if instead of a simple fast comet, it gives you a (channel time of) 1.5-2 second invulnerability as you fly into the air, allowing to position yourself while in the air. and summon a slightly slower falling comet with a very wide AOE and BIG damage directly below you BUT upon landing slows you down by at most 30% movement speed for a few (1-3) secs. An addition of a great spectacle and strategic utility of choosing the best moment to cast this amazing spell seeing your character fly and summon great damage.

Maybe its a rework of Comet or maybe something new and call it like "Cataclysmic Meteor" or "Heaven's Fall" to give it gravitas or something.

The balance out would be the slow it gives after to give drawbacks for anyone spamming it for maps and maybe the big mana cost but atleast counts as a satisfying and effective finisher move. Probably also needs a high cooldown of maybe 14 seconds or something to prevent any invulnerability spams. Assuming at most +100% Cooldown reduction is achievable making it half + Temporalis deducting 2 seconds means possibly a cooldown of 12-14 seconds minimum to give atleast 2-4 seconds of vulnerability and interaction with combat mechanics.

Or maybe thats what Flame blast could be or at most as an additional upgrade utility maybe from a Unique or some other mechanic.

Or maybe it doesn't have to be this exactly but atleast something like an in-theme skill thats not just damage but also a mobile utility especially for the spellcasters. (much like the Flame Breath of Druid Wyvern)