In tight quarters these traps limit options a lot. Add a swarm or two to the mix that does aura damage, and it becomes a pretty difficult encounter. A Hobgoblin Warcaster could potentially Force Pulse or Force Lure people into these traps, or a Deathlock Wight could use Horrific Visage to do the same. There is alway Bullrush as well, just have some minions do the Bullrushing, they'll do better damage this way, than if they were swinging actual weapons. A young black dragon tailslashing people into these traps every time someone misses him, will cause some pain.
Remeber this trap is an obstacle, it's meant more as an impediment than a threat, and is meant to be combined with other threats (see trap and hazard roles for examples).
Remeber this trap is an obstacle, it's meant more as an impediment than a threat, and is meant to be combined with other threats (see trap and hazard roles for examples).