well i guess INFB dmg is a secret created by devs …
This is my proof INFB dmg affect all MONSTERS in 13k up . this dmg is magical hahaha 
the only explanation i have is due to high HP MOBS have in high floors the calculation of CB DMG is INFINITE … oh i dont know really xD
Check my items as i say in my other replies … Just CRUSHING BLOW . then add afffix what ever u want EXP OR FARM BUILD
AVI FORMAT
bandicam 2019-12-09 12-13-10-728.avi (5.2 MB)
MP4 FORMAT
Youtube link : https://www.youtube.com/watch?v=5HFE5RnoZpI