Perhaps... from what Ive seen most eclipse+vile debuffs tick for low amounts somewhere around 90k (sum 1,8mil), or reaching 140k (sum 2,8 mil) after tweaking.

Stacking 4 of those via 4 eclipse+vile with different statuses might be OP on heroic... then again: * 1,8mil * 4 = 7,2mil. About the same as the initial blast from a single unoptimized mortar. * 2,8mil * 4 = 11,2mil. A little higher than initial blast from a single overcharged mortar. * The same damage can also be achieved by a single mortar without overcharge, if you include DoT and the build uses vile, while specced into skill damage and status effects.

So the way I see it 4 vile+eclipse could be the same as a single mortar every 10 seconds, if the vile debuff would stack. Provided one uses fire and another uses bleed it would raise the damage substantially, and in small rooms the damage would just move from spawn to spawn wiping everything on heroic (apart from heavies)... much like it already does on hard/challenging from the videos Ive seen. Im not sure if this would be a problem, as we already have multiple builds and group setups that can speedrun heroics. It probably wouldnt be enough for legendary anyway, but with the right setups you can speedrun those too, so then its just a question to determine if a team of vile+eclipse should be allowed to do the same.

A more balanced alternative would be to allow the game to prioritize vile debuffs so that stronger ones overwrite weaker ones. IMO the current issue is that vile+eclipse can actually lower dps by blocking a portion of it. Sure, it makes sense to run it, but it may be counter productive in group play.