How exactly do they interfere? Does it cost more mana to cast the spell, does it become weaker, or does it affect your own units? Please tell me, because I don't know.
P.S. I really don't know, so my message doesn't mean that you're wrong.
Well, I don't play as the Stronghold very often, but I have observed two effects.
1. The spell power of the Chaos spell was reduced by half when cast.
2. The spell didn't work at all.
Творят настолько черные дела,
Что до таких блистательных идей
Не вдруг дойдет и записной Злодей
Темный адепт клана GODS