Hexos is a special challenge boss in Brawler's Guild. It is quite a dps and awareness check. However, with a few clever tricks you can simplify it to a simple zerg fight.
In the video you can see me perform following steps:
1. Hexos unlike other bosses instantly puts you into combat, in my case I drop it using Salyin Battle Banner
2. I go into stealth, using Stealthman
3. Order my pet to attack
4. Proceed fighting boss
From this point on you will not have to worry about solving the maze as you fight, you will receive no damage.
Further testing I've done proven that minion doesn't need to hold aggro, simply must deal first hit, while you are out of combat. Hexos even after focusing on you will not harm you.
This strategy is not limited to warlocks only. Hunters can perform it just the same using simply feign death. But, potentially any class could do that as long as you have some guardian, minion to take initial aggro.
Apologies for poor video quality, also I hid my ui because as of now it's a mess.