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IIRC, both Adventures in Middle-Earth 5E and Beowulf:Age of Heroes pretty much does this with their INT skills in regard to like History/Arcane/ETC minus the Disadvantage (respectively as Lore/Legends).
So,ya that would work too.
Honestly, I think the Warlock makes for a pretty fine Gish, or at least a starting point for one, in 5E. And with the updated Pact of The Blade, even more so.
As much as it would be crazy form that, the Sketched Nightmare(?) seems to have what looks to be two horns.
Granted, Uni could've been corrupted and gained a demon horn.
I'm sorry but, for the Final Fantasy 14 TTRPG free trial, did Square-Enix SERIOUSLY gave no preview jobs to play as? How are you supposed to try it out with no Jobs to play as basically?