User blog comment:黒いウサギ/DBC - The One With Horns/@comment-28742975-20170512012358

I don't known much about Onis but most seem to prefer Dark Vessel Ibuki to Oni Boss and run more of Vessel. You don't really need to use Oni Boss enough to warrant 3 copies, while Dark Vessel stops a lot that's good right now. Also Oni Boss is a lot less useful against most things in the meta which have anti-destruction abilities( Batzz, Athora, Jaeger, Etc)