Ok so this is a quick list of my perceptions of strength, though this is mostly based on normal mode and often around testing a specific monster. I do feel like they might be weak, or at least not up to their full potential.
As for fun combos, most have already been talked about, even a few I never considered but theres a fun one with Scutter (Stealshell) + Seras (Slippery) to stack up a ton of Def on scutter and give him a Shattershard to deal tons of dmg with it. Also Bone Ring on Slagg, plus can include another healer like Hydrim. His decent health can be converted into alot of damage.
The "combination abilities" are called Synergies :D
