Killing mobs under the Sentinax ship rewards 損壞的魔巡號信標, Which starts the quest 魔巡號之影 Turn this in to 路易桑多斯隊長 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:

魔巡號血擊信標: Commands the Sentinax to fire a Bloodstrike at your current location, unearthing Blood of Sargeras. Deals 150% of maximum health as Chaos damage.
魔巡號石化信標: Commands the Sentinax to fire a Petrum beam at your current location, turning everything in the area to felslate.
魔巡號魔化成長信標: Commands the Sentinax to fire a Fel Seed at your current location, causing starlight roses to rapidly grow.

評論來自 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 Cursed Pillagers, Putrid Alchemists and Gan'arg Engineers.
They have a chance to drop 魔巡號強效工程信標 which will create Empowered Engineering portals, spewing forth elite mobs.
Only one set of 'Engineering' 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 Engineering portals have a chance to drop 傳送石：惡魔消滅者

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 損壞的魔巡號信標, 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.

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小知識

螢幕截圖

影片

魔巡號工程信標

物品等級：16
拾取後綁定

使用: 要求魔巡號在這個區域召喚惡魔傳送門。
需要等級 45

最大叠加: 20

售價: 20

指南

Comprehensive Broken Shore Guide Nethershards on the Broken Shore

魔巡號工程信標

指南

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