So I look on the after battle value generation and mortis auras, particularly on the Fey and the Plague Furnace, are raking in a ton of value...for just standing around and shoving some models once a in a while, just because they flay hundreds or even thousands of HP off of enemy units with just their cootie aura.
Another case of minimal investment leading to maximum payoff.
Definitely needs to be adjusted. Possible solutions:
-only units actually fighting the unit with the cootie aura get hurt
-the cootie aura gets a max target limitation like healing spells, so it can only effect 2-3 units at most, not all units that stand in its area of effect
-cootie auras are made into an active effect with max uses, like Skrolk's Staff of Corruption
-the cootie aura gets weaker with either the exerting unit's stamina or HP
I would make an exception to the OG cootie aura unit, the Mortis Engine, since that one doesn't have the same balance issues as the Fey or the Plague Furnace (the Fey is a tiny, fast target and the Plague Furnace can be easily protected by its own summons and ranged units).