I'm trying to figure out the best way for a group of goblins to defensively hold a hallway. I wanted to give the front two tower shields and have the back ranks sling stones over their heads. Looking at the description for tower shield though it says that they could simply chose to take full cover. Wouldn't that make them invulnerable to anything besides a targeted spell? It would seem kind of cheap.
Is there a better way to slow the PCs down without doing this?
Is there a better way to slow the PCs down without doing this?