I don’t think Khorvash needs adjustments at all, maybe some new strategies on teams would be required:
- Remove him from the front.
- Drains his mana.
- Stun him.
Now Manticore’s mana cost seems like the issue, it already casts his spell because of empowered and can charge it again pretty soon reducing the number of things you can against Khorvash since you can’t outrun him for mana when Manticore prevents you from doing it. Impervious as it currently is makes any troop a little OP since it reduces what you can do about some troops, if the immunities would be reworked maybe some nerfs would be less required and some troops would require less adjusts in the overall.
If Mana Drain becomes the meta, and it’s a mechanic essentialy annoying becase it prevents you from playing your spells, then maybe it’s the right time to consider making Mana Shield pevent Mana Drain as well as Mana Burn.
I’ve suggested before that some traits could prevent two status/effects at once as a form to add more value and sinergy to some troops: