when cave dragons become very young they get an ability called ruff spikes. can someone please explain what this is? all the entry says is it can block movement. my guess is it would work like spiked stones, but that's only a guess. and it says it's a free action so that sounds a little too good. but making it impossible to stand next to the dragon sounds even worse.
I think it does make it impossible to stand next to the dragon. There is no statement describing a partial blocking effect (eg "becomes difficult terrain").
You can still attack it with a reach weapon, ranged weapon, the Lunge feat, or magically enhanced reach (such as Enlarge Person or Long Arm).
