Getting tricky now. I currently have a marauder with it's default weapon using ballistic as a motion phase driver. This causes the missile the marauder fires, to fly in a straight line towards the target. However, if the target moves and the missile misses, if it reaches a wall it just clips through it. I was hoping if there was a way to kill a missile upon detection of cliff level change? Update: Also, would it be possible to have the missile detonate upon detection of any unit? I've added a test map to the attachments in case anyone is willing to give it a try.