Kayn really has a very strange fate in League of Legends, debuting as a jungle assassin but being played mostly as a fighter, other champions have been buffed a bit to make him strong and then he gets buffed all the time.
Recently, he also encountered a huge bug when allowing W from the lag angle of the ancient stone pedestal, causing damage across the map.
Remember a few weeks ago, a similar error from Ornn also appeared and caused more than 3,000 gamers in China to have their accounts banned for abusing it.
Some people are happy and some are sad, especially on the Vietnamese server, there are many gamers wondering what Riot is doing when the Kayn bug has such a big impact on the match results like this.
Although Riot will definitely heavily punish accounts that use this error, waiting until then will make gamers crazy enough.
What’s worth mentioning here is that it doesn’t just happen in Vietnam, the Kayn toolbug situation has spread to many other servers around the world.
Hopefully Riot will soon have the most thorough solution to this problem, as well as find a way to completely eliminate all Kayn bugs so that the community can play the game with peace of mind.
Martin 
Samuel 
Eliana