Two Merlin fanvids with the song, Demons by Imagine Dragons.
Modern!AU (Arthur, Merlin, Gwen, Morgana, Mordred, Kara, Freya...) vid:
Vidder: Toufinus (posted January 18, 2013)
~~ I love the creativity here and how the vidder used clips of their other roles to give that modern feel for these characters. It's like a vid trailer for a Modern AU! Merlin fanfic. :)
Each character is haunted by their past lives and try to cope with remembering. Some characters aren't sure what they're remembering exactly, and others know they're remembering their past lives.
Vidder's summary (explains it a bit better :p): Arthur meets Gwen obviously. Merlin tries to redeem himself with Morgana, becoming her friend. He also finds Freya who is very attracted by the lake. :p Mordred is very confused by his dream (Arthur's too by the way).
Vidder: ImperviousAffinity (posted December 11, 2012 before the S5 finale)
~~ Fitting song choice and the clips showed some of the drama/conflict in the show throughout the seasons (a lot of S4 and S5).