Re: [Canis]
I'm not sure what that thing is yet, but it's possible...divination's not my specialty, but it's theoretically possible. Ophiuchus barracks is another possibility, and one we'll likely have to rely on our traitors for -- a shame Pecha closed that option off for himself before he left, he's the only one of them I know well enough to predict and trust. Unless....hmm. I'll think on that.
I doubt it's the Guardian himself. King invested him with power -- but King had a keystone himself, remember? Separate from Guardian -- but it could well be that Guardian is so named because he's guarding something important, like the keystone.