Weiss took her stance against Poseidon, who pointed his trident directly at her.

Poseidon: You stand no chance against me, Mortal Girl.

Weiss: You're really making me hate you without making any effort!

The arena changed into an ocean-like battlefield!

Issei: Hey! This has to be cheating! It's changed to go for that sexist dick's advantage!

Heimdall: Do you have a problem with that, mortal scum?

Issei: YES I FUCKING DO!

(Y/N): Easy there Issei. GO WEISS!

Ruby: Yeah! I believe in you, Bestie!

Weiss: Don't worry guys, he's nothing. Just an overconfident asshole!

Poseidon: YOU DARE MOCK ME, WOMAN?!

He unleashed a blow of swings at Weiss, who was dodging thanks to Observation Haki, and approached him for a-

Weiss: ICE MAKE: GUNGIR!!!

She summoned a giant ice spear, and as Poseidon blocked it with his trident, he broke it, only for the ice fragments to ignite and explode!

Weiss: Did I mention, I added some Cursed Energy? I call that the Crushed Ice Bombs!

Poseidon: DAMN!! FOOLISH WENCH!! CHIONE TYRO DEMETER!!!

Poseidon unleashed trident thrusts so fast in the air as if it was lighting!

Weiss: AAAAAARGH!!

Weiss was hit over and over again, and-

Poseidon: THIS IS AN EXAMPLE OF WHEN HUMANS DON'T KNOW THEIR PLACE!!!

Weiss was impaled through the head!

Poseidon: HAHAHAHAHAHA! I WIN!! See? This is why-

But then she shattered.

Poseidon: What?! How did-

Weiss appeared from the water and-

Weiss: WATER BREATHING: FOURTH FORM: STRIKING TIDE!!!

Using the water, she attacked Poseidon, which he defended!

Poseidon: Did you forget? I am the God of the Ocean! Water is nothing to me!! I-

Weiss: And my element is ice, water and ice have a very close combination. Also-

Poseidon: WHAT?!

Black ice bound his hands together as Weiss grabbed his trident.

Weiss: DEMON SLAYER MODE!!

Weiss held Poseidon's trident, and then stomped her foot.

Weiss: ICE AGE!!!

She froze the entire water!

Asia: She actually-

Yang: Heh, she's fighting like good old Kuzan, except with her own style!

Weiss: This trident will work well, now God of the Sea! THIS IS WHY YOU SHOULD NEVER INSULT A WOMAN!! BECAUSE WE CAN BE AS POWERFUL AS MEN!

She stabbed him with his own weapon, and-

Poseidon: I CAN'T BELIEVE THIS! I LOST TO A MORTAL, AND A WOMAN NO LESS!

Weiss: Believe it. Never mess with me. ICE MAKE: ICE TIME CAPSULE!!!

She froze Poseidon's entire body, and as she removed the trident, he shattered!

Gods: WHAT?!!

Zeus: IMPOSSIBLE!!!

Buddha: Wow. That Ice Queen is really good.

Ares: Poseidon lost to a human?!

Susanoo: Well done, young lady.

Weiss: Thank you, to both of you.

???: Those weapons she has are impressive.

Hephaestus (The God of the Forge! A legendary blacksmith who has knowledge of all weapons! He is the former husband of Aphrodite! He's actually pretty chill, and is a weapon nut! Voiced by Patrick Stewart!)

Hephaestus: Humanity might actually prevail after all.

Thor: They have spirit after all.

Odin: What are you saying?! I told you, that it's not your job to think!

Rosseweisse: He hasn't changed at all. Asshole.

Hercules: Father, let me go. I will handle this. I want ... that one.

He pointed to Yang.

Yang: Me? Ha! This is going to be good! Against Herc! Wait; no, you're not the Herc I know. That guy is actually awesome compared to you.

Zeus: Do not fail this, my Son. I would hate to have an early funeral.