Shin Megami Tensei V - Side Quest: Abaddon's Assault / Optional Boss: Abaddon
While exploring around Shinobazu Pond, you can come across a gathering of Kurama Tengus having trouble with a mighty demon, so head further to the North and you'll find...
Abaddon is a level 61 demon with a decent number of HP and a few Physical attacks at his disposal, as well as the ability to Retaliate against your own. A designated tank like Mother Harlot or Siegfried will go a long way towards making the fight easier, the former can also exploit the boss' Elec weakness.
I imagine Mabufudyne follows the Magatsuhi gathering, but I killed him first.
Return to the Kurama Tengu for three Grimoires and some EXP, and if you've completed the "Birds of a Feather" side quest, the Koppa Tengu you've helped will be there in his new form and give you... a Kurama Tengu's essence, nothing too exceptional at this stage of the game, but still nice.
Timestamps:
0:00 Accepting the quest and finding Abaddon.
3:47 Abaddon fight.
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