Kokog and Xiorg Vestige

[Bobby Baratheon]

As a fan of binders, I like the flavor of this vestige. I think, on the whole, it's abilities are decent without going overboard and the option to use Constitution instead of Charisma is interesting, but I doubt most binders will use it. Regardless, here are my thoughts.
-I think you might have gone overboard on the sign. Growing the horn I could see, or even becoming a cyclops, but two heads seems a little much. Also, it seems to me like that would have some sort of mechanical impact, which binder signs never do.
-Black bolt's damage total is good (especially with iterative attacks), begging the question why anyone would use Incineration except in specific circumstances.
All in all, I like this vestige, and I think you did a pretty good job of balancing it against itself. It does out damage other vestiges fairly significantly though, which might be a concern.