Hello everybody!
This is a short guide on how to properly beat Odyssey mode with a full Jinx team which is, in my opinion, the easiest team comp allowing you to get the so desired Odyssey Gem reward.

Nothing new here: Arsenal + Comet. There's no other viable setup to beat this quest.

ONE and only ONE Jinx must go for the build. In this way, every player at stage will have 6 Armor only to deal with since Kayn has 70 Armor dropping to 53 with and shredding it to 6 with Letality items (18+18+10=46 Armor penetration).

are picked cause there aren't better options since are pointless due to the insane damage Kayn is able to deal and are pointless due to the fact that we will NOT focus on autoattack damage but instead in our ultimate abuse to deal a good chunk of damage over time to Kayn thanks to Comet augment and passive. That's why we'll take : having less magic resistance to deal with will let Liandry's passive to deal more damage over time.

is a must to not run out of mana on stage since your ultimate will drain very fast your mana.

We will take instead of cause, even if the last one would give us more Letality, we wouldn't be able to proc its passive while Edge of Night passive can save you from a Kayn dash that would've killed you instead.

Reaching Kayn Stage is a matter of luck with RNG stages but you should eventually get it easily enough. If you get a bad first stage, just restart a new game.

Once you've reached Kayn stage, you should focus on minions clearing paying attention to 4 important things:

• Never use especially if you're the guy running the Black Cleaver build unless you want to drop some more extra damage on Kayn. It just drain your mana which you should save for your ults.
• Stay as far as possible from Kayn! He can deal insane amount of AoE damage, especially on 3rd stage. You'll focus on dealing damage with your ult on him, that means that you can just stay on the opposite side of the map and deal with minions.
• Don't waste your ! This is the only tool you can use to stop a Kayn dash. Save it for this purpose or to disable some minions you don't want to deal with.
• Save your ults for when Kayn is immobile! There are 3 major instances you should take advantage of: when he charges his Ora's attack, when he starts spamming attack and when he drops several all around him. You can use your ults to clear minions too but, if possible, try to save them for dealing damage to Kayn.

Remember that Kayn stage has a timer too so you should hurry up dealing as much damage as possible the faster you can cause after a while, you'll get a prompt tkat Kayn is getting impatient. When this happen, he'll get a speed boost and after a minute he'll enter in Rage mode. When in Rage mode, unless you're already in 3rd stage and he has less than 1/3 of health, game is over since he will constantly drain life from every player, he'll be faster, deal more damage, and will slow you.