A bit of a carry, but the video shows the correct path and how to deal with the Chaotic Portals "event" before the twin bosses of the mission. Take note: We tried a few times to single pull the Lich but were unable to and finally decided to simply kill it while Shiro was beating on us. We then ran around capturing the Altars with Shiro beating on us until he mysteriously decided to stay at Grenth's.