Killing mobs under the Sentinax ship rewards Сломанный маяк "Церберакса", Which starts the quest Тень "Церберакса" Turn this in to Капитан Руисантос at Deliverance Point. You'll then be introduced to the various items you can buy with Nethershards.

Related Items
These beacons will create portals that summon progressively more-challenging demons:

Uncommon Beacons:

Rare Beacons:

Epic Beacons:

There are also some beacons with profession benefits:

Маяк кровавого удара "Церберакса": Commands the Sentinax to fire a Bloodstrike at your current location, unearthing Blood of Sargeras. Deals 150% of maximum health as Chaos damage.
Маяк окаменения "Церберакса": Commands the Sentinax to fire a Petrum beam at your current location, turning everything in the area to felslate.
Маяк роста Скверны "Церберакса": Commands the Sentinax to fire a Fel Seed at your current location, causing starlight roses to rapidly grow.

Комментарий от Gulver

Everything to felslate?

Комментарий от markinthedark

This can't be used in combat, this needs to be used near Sentinax. It fires a petrifying beam at you, turning you to felslate for about 3 seconds, and creates 6 felslate spikes around you which you can mine. I got about 2-4 felslate from each spike.

Комментарий от hotaru251

Anyone know if they are only visible to you?

I got one on my tailor/eng. and wanna know if its vendor junk or not.

can others mine the veins it spawns?

could i use it, swap to alt, then mine em?

Комментарий от Bigman1182

On use, it will stun you and everything (NPCs, Mobs, and other players) for 4 seconds, and then a random amount of Fel Spikes will spawn. You must be a miner to gather the spikes, and it is personal loot so others can enjoy the benefits as well.

Комментарий от octapusxft

I had hoped this would also kill everyone caught in the laser beam

Комментарий от jackhammerEUFW

Drops to non-miners, is of no use to non-miners. Way to go, Blizzard.

Комментарий от Taefedon

So I figured out a workaround for if you want to gather these yourself:
1) Group with someone to stay phased/sharded correctly. I made this mistake and lost a couple beacons.
2) Get both gatherer and non-gatherer characters to the same location.
3) Equip fast-harvest gloves on gatherer. The nodes spawn for about 30 seconds, so the only way to get all of them is to have the glove enchants. Might have to fight off some of the spawned mobs. In that case, definitely try and harvest before fighting them.
4) Use item on non-gatherer.
5) Launch another instance of the game (I used the Bnet app for instant launch/login).
6) Login on gatherer.
7) Harvest and profit.

Used this method and had a lot of success with about a dozen beacons (Маяк роста Скверны "Церберакса" and Маяк окаменения "Церберакса"). Can also use a similar method to harvest on multiple characters with Маяк кровавого удара "Церберакса".

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Маяк окаменения "Церберакса"

Уровень предмета: 45
Становится персональным при получении

Использование: "Церберакс" направит в точку вашего текущего местоположения луч окаменения, который обратит все находящиеся в области поражения цели в сланец Скверны.
Требуется 45-й ур.

Маяк окаменения "Церберакса"

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