I do a TON of damage on SMN, especially with the LB. Basically hang back and cast Ruin to build your LB gauge. Use Slipstream and Mountain Buster to zone the enemy team. When my LB is soon to come up, I let all my cooldowns come up. First I'll zone with Slipstream and then Mountain Buster. Then I'll use LB on the group. As the LB is going off, I jump in with Crimson Cyclone, pop a Fester, Crimson Strike, Fester. Then mop up with Enkindle Bahamut and Astral Impulse. The burst in that combo is bonkers.