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You create your own ArenaObstaclesGroup and set FixedObstacles = true within it. After that, you add an item to the links where you can set blocked cells. You can see how this is done in the AbyssArena example. If the objects are fixed obstacles, then they need to be placed directly on the map.
I looked at Abyss. I tried to do it as you suggested, using it as an example. For instance, I took a ruined wall, which should be an obstacle. But creatures still pass right through it. Could you take a look and tell me what the error is?