Here's an alternative method to help kill the sparks. I take Mannoroth's Fury on the fight, time it so I use SS:Seed of Corruption on the boss right before the sparks arrive, and then use Harvest Life, again on the boss, once the sparks are out.Originally Posted by Varia
Between your DoTs and Harvest Life, your SS:SoC will burst while the sparks are in range of the boss, which is pretty big with Mannoroth's Fury. So you'll get damage on everyone's spark with SoC, plus you'll have a Corruption on everyone's spark for decent damage and quick Shard regen, and you can channel the entire duration of Harvest Life, which is spread out to all sparks as well.
You'll be helping your fellow raiders take down their spark as well as doing significant damage to your own, and doing damage to the boss the entire time. You'll either need to finish off your own spark after Harvest Life or get a little assistance from a tank or another ranged. Overall, you'll be ensuring everyone can get theirs down faster.
We got through 5 Sparks this way.