Hmmmm.......
They could give it a ruin 2 upgrade to Miasma, but I don't see them call it that since they are straying off from that name. No idea what to call it, it'll give it a cool looking animation....probably a sight potency increase. Not going to be Toxicon in terms of potency and AoE fall off. It'll stick to single target.
Not going to see them touching Physick anytime soon....not important tool to mess with. Adlo......untouched other than cure potency adjustment.
Lustrate isn't going to be touched nor Excog. Both of those tools are in a good spot. No one is having a issue with them.
They might just remove Energy Drain altogether. It's becoming more useless to have in SCH's toolkit....more like done on purpose, but whatever. Just get rid of it and create a new ability.
Dissipation.......If the fairy going to go poof, just give a AoE mitigation/regen although weak to not make it overpowered like they did with Expedient. Keep the aetherflow stack and healing potency. It just need something since SCH will lack pet healing for 20 secs while SGE can dmg and heal with their 2min ability.