[@Archangel89]: Hm...
Well, I'm not one to help with descriptions, per se, as that's more on the player than the GM. On that note, though, the class doesn't inherently look self-sufficient. You can't use half of your kit if the requirement is that they're smacked around by melee as a caster unless you have a phase where you use melee, so that part might need to be changed.
I do think that ice would be better served geared towards a more utility-based DPS role, though, if only because of the natural contrast against fire's all-offense repertoire.

[@Operator Luna]: Analysis time!
[list][*]I think it's sorta odd that the class is mounted by default, as we have mounts already extant within the game's systems. Mounting lends itself well to mobility (and this sort of playstyle might become more frequent post-isekai), but I think that they shouldn't necessarily be mounted from the get-go, especially seeing as how mounted combat for the low-movement, low-mobility tanks can lead to a disjoint in terms of visuals and gameplay. Imagine having to chase after a boss to do damage as a melee in normal gameplay. Yikes.
On the upside, removing that mount requirement means that the anti-forest thing is gone by default.
[*]Harvester should probably be more specialized.[/list]

That's it, really. If those changes are addressed, I don't think I have any other qualms with the form as-is.