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As someone else pointed out, it is canon that dragons can not have
bloodlines derived from Deismaar. However, I think they do have divine
essence in some form or other. Here's how my train of thought is going:

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If someone espoused this as canon, they should be tried for heresy. Dragons
were present at Deismaar. The destruction of the gods present imbued everyone
present, from camp follower to chosen champion, with a bloodline. This would
include any Dragons in the vicinity.