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To change the visuals of battle maps, go to AdvMapDesc => CombatArenas => Place the "Lord's Wall" object on the map in the background. Save, start a battle with this arena (or with your own, if you created a new one). It worked perfectly for me.
P.S. How did you determine that the wall was successfully added if you couldn't see its model?
I didn't just want to visually add the wall; I wanted to add it as an object that could be destroyed.
Added 22 hours 55 minutes ago
To change the visuals of battle maps, go to AdvMapDesc => CombatArenas => Place the "Lord's Wall" object on the map in the background. Save, start a battle with this arena (or with your own, if you created a new one). It worked perfectly for me.
P.S. How did you determine that the wall was successfully added if you couldn't see its model?

