When creepblock will become bigger problem than terrainblock.
Kayn: Coming for you
Face this *conjures wall*
Kayn: No match for me *passes through wall*
Face this *uses ult to disrupt minion wave into cluth around Kayn*
Kayn: Noooo, my only weakness! How did you know about it!
LolWiki
Fun fact, Kayn does not get the healing or extended duration bonus from champion based terrain. such as :

one exclusion from this is
ult, he just bounces off it like normal.