One thing I've noticed is that few people use Defender in the Crucible and practically none in Trials of Osiris. The idea I had came from one of the million times I've been launched by a (taken) phalanx. The exotic would be some piece of armor, probably not the legs but none the less. The basic idea would be that when a Defender "pops" their bubble all others (friends and enemies) are pushed out but can then re-enter. I think this would revolutionize the use of Defenders. In Control a Defender could use this new ability to prevent the opposition from capturing a zone. In Trials of Osiris a Defender could stop the enemy from getting heavy ammo.