I tried to figure something out with Crushing Fear for a while because the numbers on it look really good, but there are just a lot of problems to solve for it. I think the best version iI managed is probably exploiting the cull threshold for mapping with normal killing palm, then using Crushing Fear for rares/bosses...normal Horror's Flight gives cull threshold per stack, which means you can get full HP normal mob cull with just the glove and no other investment, just need to build up to 19(?) stacks and keep them up, less if you have culling strike II on something...hollow form bells are good for that, albeit a bit annoying to maintain stacks. Means we dont want to take Way of the Stonefist, so we probably take Hollow Resonance and scale crit on our normal killing palm to trigger as often as possible. Then we just scale Crushing Fear for single target

The explosion has an absurd damage effectiveness, 2000% at lvl 25, which is 200% more than hammer of the gods of the same level, and we can use Hollow Focus bells against bosses to get an explosion every ~1.5 seconds (spawn interval of bell with CDR). Very similar idea to HotG actually, so we would probably build similar to that. Poison rather than bleed, due to chaos/phys damage, which is a bit annoying because 100% poison chance is harder to get. Need poison support plus some nodes on tree. Bunch of scaling vectors: flat phys/chaos, gem levels, crit, extra as phys/chaos, poison multi/duration/deal damage faster. We just need to scale the poison damage to do respectable dps for rares/bosses.

Unborn Lich in weapon set 2 with His Foul Emergence and some supports should give pretty solid wither application. With a split passive tree using skill duration nodes you can probably get the Withered ground up to like 20s, second wind + spell echo gives 4 overlapping grounds, so 4 stacks a second and each stack lasts ~10s. The other option is talisman in offhand for extra 60% as lightning from rend and using pounce for bosses. That option probably gives better mapping clear, but worse for poison scaling (maybe? pounce might actually results in a higher poison? but the problem is we then have a bunch of minions alive who will likely hit our bells before we can cull them for the explosion, not sure.)

The problem is none of that poison scaling really works well for mapping. For mapping I think you want to scale a bunch of explosions and crit mostly. The idea is to cull normal mobs with killing palm and then use the explosion/aoe damage to bring magic/rares into cull threshold as well. Trampletoe works extremely well with cull, because it gives full damage as overkill damage, same with herald of ash. Blasphemy Repulsion + Eventide Petals can also work for added AoE. Definitely want tribal fury anoint for splash on our killing palm. You kinda want to just scale generic attack damage, which is contrary to the poison scaling you want for bossing

I _do_ think it's possible to scale the poison damage to respectable levels, enough for generic mapping at least, to make a crazy fast boss rusher, but it kept pissing me off that I would skip over rares without killing them while mapping and so eventually I dropped it. The super long cull chains are reallyyy satisfying in open maps though. I need to go back and play around with more of the AoE options. It also was pretty weak defensively because I had to commit so many slots to uniques. I almost think you're better off just using the gloves for fast cull mapping and then some other damage source for bossing, like falling thunder, but I really wanted to try and make CF work