Wicc
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It is allowed to reach the Treasury using Wings or the Fly spell, but only through generated passages, and it is necessary to kill the guard or one of the guards of that passage. It is forbidden to fly over mountains.
The Destruction Domain spell is allowed to be used in one of the cells, as close as possible to the Castle that the player is going to attack. and can you provide a link to a picture from that match showing that it is not allowed?
If we start with this?
When using Fly or Wings to select a Castle to attack or to select a battle point with a Castle, the flight path must not pass over natural obstacles (mountains, forests) that separate zones.