Drop rate is too low especially since the server is supposed to be 2x drop. Found like 3 in 20 mins and I 2 hit them with my hero. Not to mention since they fly and you can fall off the map, they often drop it off the map so they cannot be picked up. A required material for crafting quite a few items including balance furies so might want to balance it a bit better.
They are supposed to be rare, but the drop rate right now is 1x of gms at best. Isn't MR a 2x drop server?
It's all RNG, I've been farming more than enough to make a set of fury. You can get nothing in 20mins, you can also get 3-5 in less than 5mins. Making it easier will only make the crafted items way cheaper and there'd be no challenge at all since the other materials are rather common(or will be), just my two cents. GL!