Thanks Berserker, quite a bit a surprise to me, never thought this could be the reason...it works now.

A few more things I would like to report (test was done with daemon's assembly based on ERA 2):

1. Werewolves don't bersker on full moon.
So these creatures are supposed to have Bersker casted on them on every full moon (day 14-16, a.k.a. w2d7-w3d2). Although for some reason this doesn't work as intended. I also wonder if they really receive 2x lycanthropy chance on a full moon (but it's hard to test).

2. Wrong description of Storm Elemental
So it's well-known that the description of these creatures was wrong, they receive no melee penalty reduction in the game. I'm ok with that.
It's another problem - they are supposed to receive 2x damage from Amadeus (firestorm) like their lower form Air Elemental, but for some reason it has no effect.
Btw, their counter part Earth Elemental and Magma Elemental are both immune to Amadeus, which again inform that Storm Elemental didn't work as intended.

This is probably a problem from vanilla H3. But as ERA 3 has the goal of "H3 but better", it's worth to sort out some old issues, I think.