NHF – new heroes for Heroes V 3.1.

The duration of the plague effect has been reduced from 15 turns to 5, and if it doesn't trigger, there's no delay. The ability has been weakened threefold. Damage is increased by 50% from Emerald Boots (if equipped). The ability does not affect Emerald Dragons (I didn't find any other creatures with earth immunity). But I'm still against random triggering.

Why did I want to do the same thing then? :D
There are creatures (except elementals (Lava Dragon is also an elemental, Gargoyle - I don't know) and constructs and undead): Djinns - lower damage, Black Dragons...
Regarding randomness, this will solve the problems:
1) Not triggering on newly spawned creatures (it just didn't happen, what can you do);
2) Reducing the rush of the Necropolis, which is already very strong.
3) Annoying delays and the effect (fortunately, battles happen very often).

It would also be good if the ability was active, or something influenced it, but that's more complicated...

And also: the visualized damage is applied to creatures, but what if the stack is composite, where 1 dragon and 100 peasants die?

We can discuss this, in my opinion, I think the ability is very strong, especially for the Necropolis. We need to either reduce the control: random, cost; or change the way it triggers: active, which recharges over time. Or give the ability to a non-magical race. Suggestions?

Added 20 minutes later
Or maybe based on the strength of the enemy squad? If the squad is stronger, then only deal damage then?

Added 3 minutes later

Faellindriz (literally Pale Dream).

Maybe shorten it? Because the name is too complicated, and names ending in "...iz" are usually used by academics in tier 5