Naaaah Bethor's nane is Hikkikomori according to Phul :rami:
Phul: Phaleg Onee-ue, Hagith Onee-ue and Hikkikomori Onee-ue.

The Guardian names have already been revealed in their story dialogue. The only one not revealed yet was Och which you just had to spoil. Sigh.

These new tier raids are a break from the current Disaster / Catastrophe series.

Battle wise they are.... more straightforward than the Catastrophe. Less cancerous bullshit mechanics like 28k dmg Death Star Beam x 5 on one target or Charm/Sleep spam or might-as-well-make-it-pernanent buff spam. But they are by no means weak. They do not have lackeys with them and have all the massive strength to themselves, with each sporting between 200~250m hp. Their resistance is high as usual. Except for that one Hikkikomori oddball. :rami: