How successful could a BLM be at soloing modern content with a mana wall build? I watched Mischief's Schah video and it seems feasible for a BLM to solo anything that can be nuked down in under 5 minutes. AF body should keep your mana full, and mana wall + DT gear should give you 97.5% dmg taken reduction, right?
The biggest roadblock that I can think of is bosses that take reduced magic damage. Not sure how to approach that as BLM.