first of all you need to make sure you can withstand 3 attacks from the chaos overlord 4 if your speed is on the low side maybe even 5 If you haven't levelled up speed at all I did it with 18 Speed And i only needed to withstand 3 attacks I'm not sure on the exact numbers needed as I didn't do any testing on this part of the section

ok Now for the strategy You will need to lure him to the South-eastern pillar like shown in the screen-shotThen you have to run up to the north-eastern Treasure chest and leaver then run back down to where the chaos overlord is and hit him once and then get behind the cover of the pillar After you make it back to the pillar run Up to the Treasure chest and leaver to make him lose Aggro and then you can walk up to him without getting hit letting you attack him once (note only hit him once because as soon as you hit him he will aggro) Rinse and repeat until he is dead

Also make sure you approach him from the East not from the north If you approach him from the north he will start attacking you immediately but if you approach him from the east he will only attack you when you are right next to him which allows you to hit and run him much easier

Hopefully this guide can help someone playing through the game for the first time or anyone whose trying to 100% the game. This is obviously an exploit and probably not intended by the developers so if you want to fight him Honourably then that's fine too I might make more guides in the future Even if it's just to help 1 person I consider this guide a success