How to start mechagon mythic first set of bosses

Is there a npc to talk to for doing the non season mythic run. I want to farm the peacekeeper mount but keep getting taken to the second half of the zone. eh?

There should be a ‘transit’ NPC by where the second half starts, but I don’t know whether the first half is even available on Mythic right now. I think you’re probably SOL until the season ends for achievement/mount farming. It has been that way for the other returning dungeons so far.