Discord convo about this, so thought I would do a few clears of this and upload one.
Strats: Use heavy blow to push one oblobble into the center and use your soul from that to spam shade soul to keep them both away from you and on one side of you, from there, just use nail hits or nail arts to repeat the process of pushing them away from you and shade soulling for dps, ideally hitting both at once. In phase two avoid being corned by dashing through if one comes down at you and basically do the same thing. You may have more soul saved up if you use fewer nail arts. Be weary of the fact that dashslash isn't affected by heavyblow as much as greatslash, and that oblobbles always move in the direction you last hit them from.
Charms: Mark of Pride, Heavy Blow, Shaman stone, Spell twister, Soul eater Alternatively, swap Mark of Pride for Nailmaster's glory and soul catcher if you plan on spamming nail arts primarily.
