Some sort of nuke for SMN that takes whatever dots are ticking and instantly finishes the damage. For example, do your normal DoTs + Contagion + Bane. Then hit the nuke so that the enemies instantly all the damage that the dots would have eventually done over time. Give it like a 2-3 minute cooldown to keep it from bring too OP, but it would give SMN an additional way to do burst damage without it being tied to Aetherflow stacks.