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There is nothing useless; everything can be useful at the most unexpected moment...
New here? I'm Roha — want a quick tour?
Well, an earthquake isn't very effective at destroying a Fortress, although of course, if you don't have an Earth expert and a lot of magic... And can a moat be removed this way?
An expert in ballista and an expert in earth magic – they destroyed almost half of the defensive structures...
You can't remove the moat, but you can "bypass" it ;)
What do you mean by "bypass"? Do you mean using the ramp?