Post 0.3.0b Hotfix 3 Abyss monster DoT ground effects

We are in the post 0.3.0b Hotfix 3 damage reduction to the Abyss monster DoT ground effects. There are still combinations of modifiers that cause issues in fights.

* Shroud Walker - instant cast of DoT ground effect after blinking onto the player
* Regenerate Life - the DoT prevents any kind of sustained DPS to counter
* Hasted - these abyssal can chase you across the map while sprinting
* Spell casters stand on the DoT instead of walking off of it

Haven't yet seen a proximal tangibility or reviving minions/damage from minions first, but this would be fairly nasty as well. I'm sure there are others.

These rares are breaking the "Fast/Tanky/High DPS - choose two" approach to enemy mob design. Some suggestions on changes that might be made:

* Can't shroud walk in the middle of an unblockable skill (dropping the DoT on itself in this case) - all rares can do this btw, breaking the telegraph
* DoT is not centred on the mob (so it becomes terrain)
* Increased delay between recasting of DoT
* Turn it into a damage donut - much like the mana drain

I'm fine with duelling with them and hovering around on the periphery waiting for a window in which I can strike (and then get out of range again). I've had limited success with kiting into mobs and then bursting the mob group down (you soon run out of mobs). But for a melee ice-lightning chonk there's no other opportunity I can see to take them down. Happy to take suggestions.

Here's hoping this can be brought into a better place. Thanks for listening!