Offensive magic could be En-spells in FFXIV

Incoming Spikes for damage reduction

Fire Spikes - 20% damage for 20 seconds, deals fire damage every time you are hit
Ice Spikes - 20% damage for 20 seconds, chance to paralyze fodder
Dread Spikes -40% damage for 10 seconds, absorbs HP based on damage taken

No recast timer just high MP cost.

cheap FFXIV gil 

Absorb MP,TP,STR,DEX,VIT,INT,MND


Offensive magic could be En-spells but only one spike/en-spell active at one time. Its stealing a page from RDMs book but WAR stole a lot from DRK so who knows.I would seriously question a decision to put non tanking stats on tank gear ie Int or Pie. Giving DRK its own gear set would be pretty dumb, from a loot standpoint.
That being said Yoshi did mention a redesign of loot drops from coil. I have a strong suspicion that they are moving towards a token drop system like in WoW. (refering to high lvl gear drops) By adding 3 additional classes, they will be randomzing useable drops in a raid way too much.

But since they have already stated that the gear system is changing, there are no rules as to what kind of stats we could see on DRK armor.
My guess is DRK will sacrifice health or defense to gain back MP, or to use powerful attacks. He can probably also use MP to cast defensive spells. So if you go all out on Attack spells you won't survive, ect you get the point.