All attacks hit, and seem to be about as effective as you would expect. The zombie roars and strikes back, slamming a fist down on Athos.

18 to hit (with disadvantage from Zumfir), for 15 damage

Everyone is up

Athos staggers as the heavy blow crashed into him and lets out a short, pained gasp.  Then he rallies for another attack.

12 to hit again, for 14 slashing plus 1 radiant and he will add a divine smite for an additional 7 radiant damage.

Zumfir rushes to Arthos' back, toching his back as healing energy coursed through him, healing 16 damage. Then he runs back to stay on a safe position.

Twinkle winces at the zombies fist connects with Athos. Clearly the brute was not to be messed with.
Rushing forth, the monk sends a flurry of punches and kicks at their adversary, each sending a rippling shockwave through the moldering flesh.

[Action]
Attack 1: 15, damage: 7 bludgeoning

[Bonus Action] Flurry of Blows
Attack 2: 18, damage: 10 bludgeoning
Attack 3: 17, damage: 8 bludgeoning

Everything hits (AC is only 8). The zombie recoils from Athos, the radiant damage (while not doing extra damage) clearly not agreeing with him. However with Twinkle doing more damage overall, she is the one to get hit this time.

To hit: 26 (sorry) for 23 damage. Twinkle is unconscious. If someone heals then she may take a turn this round, otherwise a death save is needed. 

As a bonus action, Athos will reach down and use his lay on hands to heal Twinkle for 10 hp.  "This thing hits like a massive boulder rolling down a mountain.  Thank you Zumfir, I'll get Twinkle this time."  He'll then follow up with another attack.

(Thank goodness for that low AC)  9 to hit, for 9 slashing damage and 2 radiant damage.

The longsword mastery is sap, so the ogre's next attack with have disadvantage.

Somewhere in the back of her mind, Twinkle becomes aware of a sort of ringing sensation. Then she notices how when she tries to walk, her legs feel strangely heavy. Come to think of it, there is the taste of dirt in her mouth.

When she opens her eyes, things are quite blurry, but at least she finds out what's going on: she's laid out flat on the ground. She sees three Athoses who are busy weaving restorative magic. Ah, the zombie was also still there. Things made sense now. She got knocked out cold by those giant fists.

Groggily, the monk gets up, a lopsided grin spreading across her face. "Gotta hand it to you, big guy. That was a good punch."

"Thanks for the assistance Athos."

The monk then delivers two swift kicks into the ogres side.

[Action]
Attack 1: 24, damage: 6 bludgeoning

[Bonus Action] Flurry of Blows
Attack 2: 12, damage: 10 bludgeoning
Attack 3: 13, damage: 8 bludgeoning

In spite of seeing one of his fellow contestants fall Gimmond continued to hammer away at the meager defenses of the zombie, still aiming to take out a leg, if not an arm with well placed glaive strokes before falling once more into a ready stance to continue the fight. 

Ac: Attack with Glaive.
Glaive vs Giant Zombonie(AC 8) - To Hit: 22 Damage: 5 slashing damage. 

(OOC: My 2nd turn kind of got skipped there a bit. If still allowed to have "acted" for that turn, then the 22 to hit for 7 slashing damage would be the attack for that round. Otherwise feel free to ignore the roll)

Zumfir takes the holy water he got before the fight, throwing the bottle at the creature's head, aiming to cover as much as its body as possible with the water. "Hopefully you can stay awake this time!" Zumfir said in a joking tone towards Twinkle. 

( DC 10 DEX Save or take 14 Radiant damage )

Quote from Ranmilo >>

In spite of seeing one of his fellow contestants fall Gimmond continued to hammer away at the meager defenses of the zombie, still aiming to take out a leg, if not an arm with well placed glaive strokes before falling once more into a ready stance to continue the fight. 

Ac: Attack with Glaive.
Glaive vs Giant Zombonie(AC 8) - To Hit: 22 Damage: 5 slashing damage. 

(OOC: My 2nd turn kind of got skipped there a bit. If still allowed to have "acted" for that turn, then the 22 to hit for 7 slashing damage would be the attack for that round. Otherwise feel free to ignore the roll)

 Oops, my bad on the last round. I thought I counted 4 turns. I have added that 7 damage for last time.

Athos hits, bringing the creature to the ground, barely holding onto life undeath. (9hp)

Twinkle's first hit brings the creature to the brink of consciousness (3hp). Both of the follow up hits should have killed it, but somehow its undead nature keeps it clinging onto "life". (remains at 1hp)

Gimmond's attack is the same, it should be an easy kill but once again, the undead nature seems to keep it going past the brink of re-death (1hp). (I have been rolling high con saves for this...)

Zumfir throws the water, and the zombie looks like it might move out of the way (Rolled an 11), however due to its large size and partial decomposition (-2 modifier) it fails to avoid it all. And with the damage being radiant, it gets no save to continue and falls to the ground dead (again)!

There is no gold reward this time. But in a chest you all find an uncommon magic item of your choice. And you level up.

Whether given the choice or by simple fortune with the offered reward Gimmond ultimately finds himself rocking a pair of tough and winged boots. Although despite the potential in such a prize the dwarf still can be heard muttering at some point a small prayer of hope in not having to actually use them. And yet, if given the time to properly get used to them before the next fight (aka attune) he'd still make sure to preemptively activate them on the off chance of facing weird undead!

Wahoo! Level up baby~ Took up Battlemaster for level 3 subclass as promised and going with winged boots to help deal with flying enemies. Although the boomerang shield tempted me a great deal!

Athos finds a heavy set of armor, more than what he was previously saving up for.  "Wow, do you think someone has been watching us?"  He'll start taking off his previous armor and as he gets into this armor he starts saying tenants and mantras in an almost prayer like fashion. (As he takes the Oath of Glory subclass).

Twinkle fishes out a small ring from the chest, inspecting it with interest. Legends told of such rare minerals allowing one great feats of athleticism, if properly harnessed. This is a ring of jumping.

She has by now also internalized the teachings of her masters to a degree where she can harness primordial energies. The markings on her skin crackle, hiss and fume as she plays with this new power. Her subclass is now Warrior of the Elements.

Upon inspection of the chest, Zumfir finds an Adamantine half-plate. He inspects the armor for a few seconds, before nodding, "This will be useful." He comments, as a powerful healing light shines for a few seconds through his veins, embodying the Life domain within.

5 perception 

Athos is too caught up with the reward.

Unfortunately getting used to his new boots occupies most of Gimmond's attention during the intervening time. But before all that, his response to Athos is a smirk and words spoken in jest... mostly. "We are fighting in an arena, yes? So of course someone is watching us! I'm not sure which fight was it, my friend, but clearly you've taken one too many knocks already."

Perception: 6. 

"Definitely that last fight.  Never fought an ogre before.  A hit from that thing felt like a mountain falling on me.  Did you feel the same Twinkle?"

Twinkle rubs her jaw.

"Yeah, that was the hardest anyone ever punched me and the competition is steep. I'll have to work on my reflexes. Thanks for getting me back up, I thought I was on the way to my ancestors for sure."

Perception: 11

"Well, don't worry too much. If you fall, I will make sure you get back up, as strong as before. As long as I am standing, no one falls." Zumfir reassures, doning his new armor

The rumors are that the next fight is something big. Though Zumfir hears slightly better. It's not one big thing, it's a big group. Your next challenge is numbers. 

I'll give you a small time to prepare so I can post a map when on my laptop tomorrow. And you can also let me know if you want to position yourself anywhere else other than by the left gate you start at