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 Haqin

Quick summary:

Can be looted from mobs under The Sentinax or, for a much better drop rate and often in multiples, from the Broken Shore rares that show up on your map.
This beacon, when used under The Sentinax, will summon 2-3 demonic portals that spew forth Spellstalkers, Legion Webspewers and Legion Venomretchers.
They have a chance to drop Маяк великого боевого зверя "Церберакса" which will create Empowered Warbeast portals, spewing forth elite mobs.
Only one set of 'Warbeast' portals can be open at a time, using a beacon while one is already open will extend it's duration. If the portals are Empowered, an uncommon beacon will still extend it's Empowered duration (which is useful!)
The elite mobs from the Empowered Warbeast portals have a chance to drop Камень портала: Ан'тина

What's The Sentinax?
The Sentinax is a Crusade Ship that moves about the Broken Shore, you'll be able to see it on your map. It stays above different areas of the zone for 3 hours, then moves on.

When you are in the area underneath it, you gain the buff The Shadow of the Sentinax. Killing creatues while having this buff gives you a chance to loot one of the uncommon Sentinax Beacons. The first time you do this you'll get a Сломанный маяк "Церберакса", which gives an introduction quest to the Sentinax concept. I got my first uncommon Beacon from the same mob that dropped the quest item, so it seems you don't need to have done the quest to start looting Beacons.

The drop rate from these mobs can, at times, seem frustratingly low, so look to kill the rare spawns around the Broken Shore, which always drop one or more.

Using one of these Beacons causes 2-3 portals to open up around the area and spew forth a few waves of mobs. Once the waves are defeated, the portal closes.

Rare versions of the beacons, like the one linked above, can drop from the mobs that come through these portals, which create Empowered portals. These spew forth Elite mobs that have a chance to drop Epic Beacons, which summon Demonic Lieutenants.

So, what's the point of all this Beacon looting? Well it's primarily a design to make farming Nethershards a little more interesting. There are also a couple of related achievements though: Bringing Home the Beacon and Naxt Victim. You will also need to farm a few demonic lieutenants for the quest Mark of the Sentinax.

Edit: For extra info and clarity.

Комментарий от geekygirlish

Blizz needs to tweak this on servers that are faction lopsided. Ours is predominantly alliance, and it is impossible to tag any of these spawned mobs with the swarms of alliance around.(I am sure Horde heavy servers are having the same issue). I called down two beacons and didn't get a single kill. Just a quick note, I thought I was being clever by going off to the side so I stood a chance to get a mob, the portal comes down on a random beam and can open anywhere.

Посмотреть в 3D Ссылки

Краткая информация

Изображения

Видео

Маяк боевого зверя "Церберакса"

Уровень предмета: 45
Становится персональным при получении

Использование: Приказать "Цербераксу" призвать демонические порталы в этой области.
Требуется 45-й ур.

Максимум в стопке: 20

Цена продажи: 20

Руководства

Comprehensive Broken Shore Guide Nethershards on the Broken Shore

Маяк боевого зверя "Церберакса"

Руководства

Дополнительная информация

Внести вклад