Part of what I'm going for with advice here is how to sell it on DM's Guild. Give me a hook about the class, describe what kind of person takes this class in a way that makes them sound different from things like Bard and Rogue.
In some ways, this is a pulp adventurer, an explorer who's been everywhere and seen everything. They expect the unexpected. A good, evocative description will help this catch people's eye.
Oh.Yeah. I'm totally going to write the descriptive portions.
I just want the crunch parts out there right now.
Have no worries there :)
One small suggestion on the Spellfire feat/ability: The reaction Absorb Spell is way too good. In itself it could very well be a feat (targeted by a spell, counter as a reaction?); as an incidental means of recharging is just way too much. It also encourages Spellfire users to spend all charges as quick as possible and walk around with 0 charges, thus becoming almost immune to spells.
Make it like 3e: You need to Ready an action to absorb spells as they're cast. It pretty much sucks (you have to be lucky enough that the enemy casts a single-target spell focused on you), but, honestly, the spell-absorption isn't the main draw here.
Compare it to Defensive Duelist and you'll quickly see it never scaling back.
Think about it this way: if you use your reaction to absorb a spell, that means no AoO, no Shield/Feather Fall spell, etc. for that round.That's what my thought was when I was designing it.
It could definitely work as readying an action, though.
On that note... I need to see how counterspelling actually works in 5e.
Like, the action of doing counter-magic.
I don't think I'd seen rules on that lol