Regen would benefit the greatest from spiritual.
"All right, they're on our left, they're on our right, they're in front of us, they're behind us...they can't get away this time"- Chesty Puller US Marine Corps
I'm confused as to why you would pick a secondary to match your desired alpha slot. That seems like putting the cart before the horse. But yes, Regen gets the most benefit from it.
"That's because Werner can't do maths." - BunnyAnomaly
"Four hours in, and I was no longer making mistakes, no longer detoggling. I was a machine." - Werner
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I want to make a DM/? with spiritual as the alpha slot, what secondary would benefit greatest from what spiritual has to offer?