This Arsenal was the monthly reward for completing trading post activities in November 2023.
It contains the following items:

М'торий, кинжал Высшего Замысла
Тесавир, меч Высшего Замысла
Песня Пустоты, посох Предвестника
Горридар, темный клинок Раскалывателя
Ярос, палаш Рассекателя

The last two items were added during Blizzcon 2023. A couple of days after the monthly reward went live. If you already completed the November Trading Post activities and used the Arsenal before Blizzcon you've not received the last two items from the list above.

There are new NPCs next to the Trading Post who offer these missing items. Кербьорн for the Alliance and Меликри for the Horde. However, as of writing this comment you can't buy those missing items from them. You'll just get an error message if you click on the items.

Blizzard is aware of the issue. They're working on it.
https://us.forums.blizzard.com/en/wow/t/updated-114-november%E2%80%99s-trading-post-is-out-of-this-world/1697785/114

UPDATE (Nov. 10, 2023):
Just recieved the missing transmogs immediately after logging in on my warrior. No interaction with any chest or vendor required.

UPDATE (July 24, 2024):
Blizzard is adding the Cosmic Weapon Cache to the Shop starting today until August 30, 2024.
https://worldofwarcraft.blizzard.com/en-us/news/24115315/wield-otherworldly-weapons-with-the-cosmic-weapon-cache

Комментарий от Drakano

No bow, crossbow, or gun. Also no shields. GG Blizz for not caring for all classes...

Комментарий от alewiina

Super disappointed... as a main hunter, side monk that uses fist weapons, this reward is completely pointless >.>

Комментарий от Ammeg

If you transmog either the: Gorridar, Darkblade of the Sunderer or Seetheras, Broadsword of the Sunderer and talk to the Twilight Hermit you get the following dialogue:

That weapon you hold... you should not have brought it here!

> You recognise my weapon?

I warned you before that the end times are coming. That weapon you wield prove it.
It emanates the same energies that coursed through the Dark Titan's blade.
Why did he strike this place? He was far too masterful a tactician to choose this target by chance.
His crusade sought to eradicate all life from existence. Do you think his final act before being captured by the Pantheon would not be in service to that goal?
Tread carefully, <class>, lest you inadvertently find yourself serving the same cause.

If you transmog either the: Taesavir, Sword of the Grand Design or M'thorus, Dagger of the Grand Design and talk to him you get the following dialogue:

That blade you hold... it profanes this place!

> You recognise my blade?

To bring a weapon like that here is to invite destruction, <Class>.
The titans care only about their precious Order. They would sacrifice anything to achieve it--including their own followers.
Even the Dark Titan had a pattern to his actions. A cold logic intended to impose his perfect vision, and the willingness to eradicate existence if he could not achieve his ends.
Do you think the rest of his kind are any different? Only in method, not in goal.
Be careful that you do not blindly become part of their plan.

If you transmog Voidsong, Stave of the Harbinger and talk to him you will get the following dialogue:

Your stave... it whispers to me!

>You recognise my staff?

Do you have any idea how ancient that weapon you wield is, <class>?
There was a time when the whole world was ruled by the Black Empire. It was beautiful.
The masters bestowed gifts upon their faithful. That staff was once such instrument.
It was given to the Harbinger so that one day she might... she might...
What? No! I was not going to tell them! I... I...
<The orc goes silent, as if chastised by some unseen presence.>

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Использование: Дает иллюзию внешнего вида космического оружия.
"Оружие, выкованное из первородной ткани космоса. Никому не известно, кто и зачем собрал эту коллекцию. Но владелец любой такой вещи непременно привлечет внимание всех, кто жаждет силы и власти."

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