Quote Originally Posted by Kalise View Post
Foul looks sort of like Level ? Shadowflare from FF Tactics.

Outside of that, I can't help but think that it might be the "Ancient Magick" of the Dark school of spells.

I.e.

Aero > Aerora > Aeroga > Aeroja > Tornado

Blizzard > Blizzara > Blizzaga > Blizzaja > Freeze

Dark > Darkra > Darkga > (Darkja >) Foul

Fire > Fira > Firaga > Firaja > Flare

Stone > Stonera > Stonega > Stoneja > Earthquake (Sometimes it appears as Quake > Quakra > Quaga)

Thunder > Thundara > Thundaga > Thundaja > Burst

Water > Watera > Waterga > Waterja > Flood

I don't recall we've seen anything beyond Darkga in any FF game, so it might be that FFXIV is establishing Foul as the ancient magic for the line. Maybe we'll also see a Darkja spell at some point (Well... It'd be Dark IV in the English localization for the game )
Dark IV already exists in game (Can't remember what casts it but its on Garland Tools so its in game) so it could be the next step, but dark isn't a BLM spell in xiv, so I'm not sure it would be that. I think its makes most sense as an holy antithesis (both being exploding orbs of light/ dark respectively) and is a XIV exclusive concept.