Dungeon Master Forum

There are a few behaviors I can think of that would make nice options for holder objects.

No turning - but not necessarily restricting movement off the tile
Restricted facing - the party might be restricted from turning to face specific directions (such as only north or east)
Restricted off-tile movement - same idea, with the party prevented from leaving the tile in some directions (such as only north or south along a corridor)
Opbys - spells could be temporarily frozen, monsters could be blocked without teleporters (and without extra movement sounds), etc.

The first three can all already be done with teleporters, and would make holders complicated enough that perhaps the added complexity of using teleporters is not a huge problem.

I like the idea of adding opbys, though.