At 12:46am EST under threat of "last pull" and after roughly 9 to 10 hours of work on the last boss of TFB 16m HM over 3 days, Memories of Xendor (MoX) has defeated the huge slug.
5/5 16m HM
1) Jesus H Christ this boss...
2) I hate that phase 1 is so long
3) This KINDA seems overtuned
4) Moooooooooooooooooooooooooooo (says the spawn)