Ok, this is not really an exploit, there is no benefit from it. There is even a side effect of being naked. I did report this when Godslayer came out however don't think they bothered fixing because there is no harm/bonus. But for some being naked is better then being an ugly voodoo clown all the time.
Go get your Jiang Shi vampire faction up. Then buy the "Path of the Enlightened" faction spell.
Now once you are in hyena clown mode, click on "Path of the Enlightned", it will turn you into a Jiang Shi (btw, this looks way better then the clown look, cant understand why they didn't do something like this for the Liche.
Once it wears off you will now be you once more, just naked is all. No more clown face until you zone or die. And for those that don't know what the path spell does, it gives some perks, and if you are hunting / killing in Karakorum it also removes the negative effects from that region.
You will also appear naked to everyone else sadly.
Devs, if you wish to fix you could do everyone a perk and make the ability a 2 effects. Divide the GFX portion and the effect, make the effect wear off but make the gfx a click to disable like a buf. This would help RP (some may want to RP being the vampires, and would give necros (or anyone with the spell) a nice gfx change ability.