Arthur time travels

[achtana]

I'd like a fic where Arthur is the one who travels time, maybe in some far of universe modern!au merlin confided in him and told him what all went wrong. And arthur is now back in camelot to fix things.

Or some canon story.. where merlin dies and arthir tries to right that wrong.

I'd really like a fix where arthur is more knowledgeable and where he can fight with all his might for what's right.