Very interesting concept. Rune Fencer would make a good magic tank, like it was in FFXI. Only change I would make is instead of Scythes, I'd have them use Great Swords like DRK, but different kinds like design, etc to match what it was in FFXI gear wise. RDM and Rune Fencer could share interesting interconnected lore and could possibly tie into the RDM storyline and (hopefully) we see a certain miqote making cameo appearances.