So for whatever reason at the time of uploading this video, there's a glitch where Amon doesn't create the Ice Pillars that we use to hide behind to avoid Curtain Call.
Thankfully it is still possible to beat him, but it requires good DPS and saving all bursts until Amon is at around 20% HP. Killing the slimes is still needed as they inflict Silence on everyone, making the Mage DPS unable to attack. The wizards and snakes can be picked up by the tanks and ignored.
Wasn't expecting a 24 person Savage Raid in Dawntrail but hey.