Lets have a look at displacement and layer shader and copying shaders around to make a spikey ball. Check out my glass render tutorial here: //ace5studios.com/glass and the progressive render stuff at: //ace5studios.com/progressive-rendering-and-render-settings/   See whole materials series: https://ace5studios.com/tag/materials/

Struggling with glass? struggle no more! In under 10 minutes you’ll know all the secrets to realistic glass renders! nah im just kidding, the secrets are infinite, but this should get you started on the right path. You now have...