It is a trinket so you do, in fact, need to equip it to use it.
This item has been adjusted since its PTR release and now only summons 3 Призрачный сорвиголова, each with 334k HP, for 10m.
Credit to Surveysays for this information. I can also confirm this after using it on my warrior.
Once used on your character, you do not gain any type of buff: meaning that if you un-equip the trinket the NPCs will disappear.
Afterwards, the NPCs will NOT re-appear if you re-equip the trinket. You will have to wait for the 1hour CD.

Information about Косохрип:

This NPC is a rare elite on the Вневременный остров.
When spawned, his coordinates are (61, 88).
He has relatively low HP (1,969,705) and usually dies quickly.
He spawns underwater, only after killing each wave (3 waves) of his undead crew (5 NPCs), during the "Battle of the Barnacle".
The battle will be marked as a small icon (crossed-swords) on your map if you are near the spawn location when it takes place.
The spawn timer appears to range anywhere from 30m - 3hrs (longer than any of the other rare mobs on the Isle, aside from Голганарр.)
Credit to IAwful for the approximate time range.
If you are near enough, you will see the following red text in your chat log when Rattleskew, himself, appears:
Rattleskew yells: RATTLESKEW!

Комментарий от TheDarksavr

I live at this spawn and let me tell you after like 30 kills this thing is still a no show. That 3% seems high to me.

Комментарий от Kaidelair

Typo "Rap the leg on the ground, summoning girls to satisfy you in combat for 10 hours"... Oh i wish.

Комментарий от maely

So this item is basically the same as the Crate of Kidnapped Puppies, right?

Комментарий от Pgans94

The mobs summoned by this are classified as guardians, and do not have direct control bars. They will attack your targets, and unlike pets, can be killed easily with AoE. This mostly comes into play if you are attacking a firecow (Burning Berserker especially). Fun for messing around, but not worth most other trinkets, avoid keeping equipped while on cooldown after the guardians are gone.

Комментарий от Sipder2

А сумка могла бы быть и побольше, this was the hardest achievement in Mists of Pandaria.
I got this on the last day of the expansion: 14 December in 2011.
For this achievement I've spend a total of 4 mounths playing 4 hours a day.
This achievement is hardest cause do you need loot rare items from rare mobs.
Even the rares having 30 to 60 minutes spawn the problem here is cause those rares has low hp and die fast, making you lose then.

Another factor that make this achievement hard, is because the items needed has low drop chance.
For example the Поводья грозового ониксового облачного змея, this mount has 0.9% drop chance, and was my last item for conclud the achievement.
I've spend a total of 400 trys to loot this mount.

My strategy for don't lose my mind while doing this insane grind was watching one piece while the Huolon doesnt spawn.
The addon called Rare Coordinator was great to track the rare spawn times, but I guess it's doesnt work on Dragonflight, cause you need other players to tracking with you.

Don't forget to use move speed items and teleport to reach rares faster.

Going To Need A Bigger Bag (All Items): https://youtu.be/HyUKlWzD2cU

Комментарий от Epifany

Made a Rarity string for anyone that wants to keep tabs

AV4xXlReU2l0ZW1zXlReTjReVF5TdHlwZV5TSVRFTV5TbWV0aG9kXlNOUENeU2xhc3RBdHRlbXB0c15OMF5TbmFtZV5TQ2FwdGFpbn5gWnZlemRhbidzfmBMb3N0fmBMZWdeU25wY3NeVF5OMV5ONzIwNDhedF5TY2hhbmNlXk4zMl5TZXhwb3J0XkJeU2F0dGVtcHRzXk4xM15TaXRlbUlkXk4xMDQzMjFedF50XlNzaWduYXR1cmVeU1JGSTJQRDRqT2pKME5udGdJbmMvWkE9PV5TYnVpbGReTjcyM150Xl4=

Комментарий от Cuffouis

The current reset timer for Вневременный остров appears to be 15-minutes. This means if the zone has been empty for that amount time, that particular shard/layer will reset the moment you reenter the zone. This can be a highly effective method for farming rares for А сумка могла бы быть и побольше, opposed to the traditional camping method of every 30-60 minutes, especially on RP servers, War Mode and Chromie Time groups.

Комментарий от khorgaz

Got this after 85 tries.

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