There was some loose talk about Celes' ability from FFVI in a thread about quick magic. (http://forum.square-enix.com/ffxi/th...ck-Magic/page2)
I think the idea is neat and I figured I would give it some attention. I would personally want it as a job ability on a lower cooldown.
History:
Celes original job ability Runic, enabled Celes to nullify the next magic spell cast and absorb the MP used to cast it. The ability canceled any magic, offensive or defensive, and from any source, ally or enemy. It required her to wield a sword that was capable of using Runic. It also required that she not do any other actions. There were some spells that Celes couldn't Runic such as Meteor or Meltdown, because they hit every character in battle.
I like most of the idea Duelle already came up with for it and I'm happy to give credit to him/her.
Runic - Job Ability - 3 minute cooldown
Instant - RDM stops all actions. The next offensive spell used by the enemy against anyone in your party is redirected towards the RDM. All status effects are nullified and all damage spells hit for 1/2 of the total value of the spell. The RDM gains 1/2 of the MP used to cast the spell.
Runic would be a buff that could be canceled so that RDM could resume actions.
Pro's - You gain MP for doing it successfully. You can shield your team from harmful effects that would potentially wipe your party. You can shield pets and shadow users from AOEs that disrupt their ability to function.
Con's - You can't do anything while in Runic. You take damage from damage spells. In the case of AOEs, you will be taking 1/2 of the total damage your entire party would have taken.
Big AOE = You Died.
Much like everything in FFXI, timing and discretion are key. Do you use Runic for the first spell cast or wait for a big one? What is more important, nullifying status effects or damage? Can you even take the full brunt of the next big AOE or is it going to kill you?
I wouldn't be against other classes getting it instead. A magic tank would be a nifty thing to have. I only put it in RDM because we already get magic defense bonus, phallanx, shell, stone skin, and bar spells that could be utilized to soften the blow against us.