Self-quoting, with an edit (besieger has become besiging force):
Quote:
Likewise, with a mere commander besieging the tower, and another commander defending the castle, Arcane Masonry failed to repair the walls; the defence was at 0 before the spell was cast, and remained at 0, even though the besieging force was very weak (so the spell had no effect).
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In other words, the spell failed to repair already damaged walls (down to 0), with no actual besieging force, so the spell had simply no effect. Defence should have gone back up to 49 or 50 (the maximum), but instead remained at 0, despite the lack of besiegers.
Its effects are supposed to happen before the attacker/defender contest (to the best of my knowledge), so it will only serve a purpose in battles where the besiegers are unable to fully bring down the walls in a single turn. The spell might also be useful in that kind of situation, if it prevents the besiegers from storming the fort: technically, the defence of the fort would go up after the spell is cast, thereby making any storming impossible. The spell is unlikely to have such effects though.