Board Thread:Dark Souls/@comment-16849357-20160811025949/@comment-91.97.146.16-20160811092643

Might be.

The scales definitely grant immortality. Invulnerability is implied, since Gwyn's lightning was such a big deal. So it could really be that exposed flesh is highly vulnerable, as with the dragon's tail and of course, Seath.

However, even if stoney is invulnerable on the body, severing his tail should kinda alert him, anyway. There are a few connections between stones and dragons in DS3, also with meditation. Looking back, the fella might have been meditating, so he didn't notice. At least that would explain it. I would be mad if you chopped of my tail. Like, seriously! (ò.ó)