Perdition, Bunker E15 and Concealed Void are the Europa Lost Sectors you'll encounter in Destiny 2.
You can start exploring them all as soon as you complete the first Beyond Light campaign mission, unlocking Europa as a Patrol space.
Finding each Europa Lost Sector location will come in useful for certain questlines and bounties - such as Born in Darkness - so it's worth learning where they are for future use.
Be warned if you're just getting started with Beyond Light, however - you'll need to be a much higher Power level to stand much of a chance of surviving them. As a result, it might be worth waiting until you've done the campaign first!
Additionally, once you have completed these once and have reached the soft level cap, check the destination map to see if a Legend or Master difficulty version is available. Completing these solo will give you a chance of a Beyond Light Exotic armour piece drop.
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There are other Lost Sectors - Exodus Garden 2A and Veles Labyrinth - also added to the expansion if you want to explore the Cosmodrome instead.
Destiny 2 Perdition location
Perdition is found within in Cadmus Ridge on Europa, in the north-west of the location.
Stand in the middle of the area, and look to the north, where you'll see a large, angular cliff looming over towards the left.
Head in that direction, and look underneath, where you'll see a set of caves with the telltale Lost Sector logo in-between them.
Of these caves, you need to through the right one.
This will head down underground. Follow the linear route round until you reach the Perdition Lost Sector location.
Destiny 2 Bunker E15 location
Bunker E15 is within Eventide Ruins, in the middle of the location.
To find it, locate the large building in the middle of the area.
You can enter this building from the west side - there's a series of steps and ledges heading up to help you get there.
Once inside, turn right and look to the far corner. There is a ledge there you can leap across and into.
From there, head down the linear path until you reach the Bunker E15 location.
Season of the Lost is here, with new Exotics such as the Ager's Scepter and the long-awaited arrival of crossplay. New activities include the Wayfinders Voyage, the Astral Alignment activity and finding Atlas Skew, Trivial Mystery, Enigmatic Mystery, Ascendant Mystery, Data Cache, Parallax Trajectory and Ascendant Anchor locations. Elsewhere, we've seen new Nightfall weapons such as the Uzume RR4, Plug One.1 and Hung Jury SR4. Other recent new features include transmog and materials Synthstrand, Synthcord and Synthweave, the Splicer Gauntlet and Decrypted Data used to upgrade it.
Destiny 2 Concealed Void location
Concealed Void is found within Asterion Abyss, in the middle of the location.
This one can be a little tricky to find as it's inside an underground cavern underneath the area, but there's a few routes to get there.
For example, you can find one of these entrances from the northern side; if you stand next to the raised area of rock swelling in the centre of the location, you can see a cavern if you look to the west.
Once underground, you then need to find the cave leading to the Lost Sector. This has a small entrance but is tinted red to make it stand out. If you took the above north-west entrance, it's right as soon as you enter the cavern.
Follow the linear route from here until you reach the Concealed Void Lost Sector location.
There are other Lost Sectors - Exodus Garden 2A and Veles Labyrinth - also introduced in Beyond Light if you want to explore the Cosmodrome.