Stoneskin is a must. Get it. During fights you can use it to negate some smaller attacks or lessen attacks that you know are coming, big ones. It is good in HM and EX fights, at times I will toss a SS on a member that needs it when threat is locked and it looks as if they are taking too much dmg to help save mana. As OT I will toss it on the MT as well, help with saving mana. Mercy Stroke really shines on trash. 20% heal is nice when it is the killing blow. Just keep an eye on the enemy list and when it's about to die pop it. It is also a 200 potency skill and does some pretty good dmg. I use it on bosses as soon as it pops and again after CD has expired if boss is still up.

Mercy stroke is not as important, IMO, as Stoneskin though. Stoneskin first if you don't have it.

Syn