New DRK here:
I'm learning both the class and how to properly tank in behalf of raid content. Recently hit level 50, so I do not have access to Carve & Spit yet.

The use of Dark Arts; It's tempting to really go at it while you regain a bit of MP back with Blood Price (Which recovers only a fixed ammount of MP per hit, if I'm not mistaken? Or so I've seen...), but you get depleted of MP quite hastly if you use many times (And even with Delirium combos between each DASE, it doesn't mean the MP lasts long): Which point on your MP pool do you decide to stop using Dark Arts until you recover enough MP?

Besides that, I would like to know if Carve & Spit is an offgcd ability, working as a free Ether every minute, or as a huge hit.

Also, I would like to know what am I going up for if I'm looking for a raid group; what kind of stuff is the people looking for a tank going to ask of me, besides tanking their stuff, being resilent, and all the givens of the task. Thank you very much.