"In Legacy of the Void, nydus worms are invincible while emerging. The main effect of this change is that workers will no longer be a viable defense against nydus worms." Source: http://starcraft.wikia.com/wiki/Nydus_worm So why not use it as an expensive Zerg Force Field? I mean attack the natural, block the main with Nydus Worms. You now have a Force Field that can transport your units out of trouble if needed. What do you think? Could this actually work? EDIT: The problem is that it takes 20 seconds to set it up. But still, im intrigued how long will they be invulnerable after the 20 second setup.