Epoxy would probably be my choice, it's inert, bonds well to most things, and is fairly easy to work with.
Might also be able to use the expanding gorilla glue, but that would be messier and harder to work with.
What sort of damage is it, posting a pic might help with the advice.
As for making something look weathered/less human-altered, burning with a torch and scrubbing the char off works pretty well. Great for cut ends and such.
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