Uses for 5* Cull?

While the game's bugged, I might as well as for some tips. what are some uses for a 5* unduped Cull Obsidian? just pulled him and I'm wondering what to do, especially since he needs high sig levels and is getting nerfed/fixed. I'm currently at 5.2.4 in progression if that helps in any way.
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Unduped he has one rout buff, duped gives a fury buff in cool down, multiple rout buffs possible and the sig level shortens the cool down
For most content he already crushes the opponent before you need a second rout buff, he is not really good for the long fights because of his low block proficiency.
So he is great for event quest and he is one of the most fun champions to play in my opinion, it’s hilarious sometimes
He is getting a nerf soon, so you might want to wait with putting resources in him