To get five Battery Casings for Astronomer Vega in Fisch, start Vega’s quest at the observatory, then head to Sunstone Island, speak to Merlin, drop into the Chasm, and fish the Mineshaft pools until you have all five to turn in.
Farm five Battery Casings by fishing the purple pools inside the Mineshaft. Astronomer Vega gives you this opening objective in the Astral Observatory update before the telescope questline gets underway. There is no secret chest or puzzle involved — every casing is a fishing catch from the Mineshaft. Here is the fastest clean route from accepting the quest to handing the casings back.
Battery Casing farm at a glance
| Need | Detail |
|---|---|
| Amount | 5 Battery Casings |
| Where to farm | Fishing in the Mineshaft, reached through Sunstone Island’s Chasm |
| How it drops | Random fishing catch, roughly a 1-in-100 pull |
| Access NPC | Merlin, for the Chasm entry buff |
| Turn-in | Astronomer Vega, in the observatory laboratory |
Key Start the objective, follow the route into the Mineshaft, and keep fishing until the tracker reaches five. The only variable is how many casts the drop rate requires.
Starting Astronomer Vega’s objective
Activate the quest before starting the farm. Head to the Astral Observatory on the main platform, enter the laboratory, and talk to Astronomer Vega. She gives you the opening objective and every step that follows. Accepting it adds five Battery Casings and lens materials to the tracker.
If you are just getting into the update, open the codes menu and redeem ShootingStars exactly as written while it is still live, since Fisch codes rotate out with later patches. Once the objective is active, head out to collect the casings.
How to reach the Mineshaft and farm 5 Battery Casings in Fisch
Key The Mineshaft sits behind Sunstone Island’s Chasm. Enter the Chasm, fish until you have five casings, and return to Vega.
STEP 1/5
Sail to Sunstone Island
Spawn a boat at Roslit Bay, sail across the water to Sunstone Island, and climb the ladders leading up the cliff.
STEP 2/5
Speak to Merlin
Find Merlin on the island and select I need to enter The Chasm to receive the protective buff. If the option is missing, hand in his required shards first.
STEP 3/5
Drop into The Chasm
Jump into the purple void near Merlin to enter the Mineshaft below.
STEP 4/5
Fish the Mineshaft pools
Cast into the glowing purple water and continue fishing until all five Battery Casings are in your inventory.
STEP 5/5
Return to Astronomer Vega
Return to the observatory and give Vega the five casings to complete the objective.
Video help
Fishing up every casing in the Mineshaft
Once you reach the Mineshaft, the farm is pure repetition. Cast into the purple pools as you would at any other fishing spot. There is no special pickup point, chest, or interaction to find, and you do not need a specific rod, bait, weather condition, or time of day. Whatever rod you brought will do the job.
Each successful catch displays a Battery Casing notification in the bottom-right corner, while the quest tracker increases with every casing. Keep casting until the counter reaches five. Players also farm scrap metal in the Mineshaft, so check each catch carefully — only Battery Casings count toward Vega’s objective.
Drop rate and farming mistakes to avoid
The most common mistake is searching for a hidden interaction, such as a lever, rare node, or special casting spot. None of those are involved. Battery Casings are ordinary fishing catches, so progress comes from staying at the pool and continuing to cast.
The catch rate is roughly a 1-in-100 pull, and luck enchants do not raise it. Exact odds have not been published, so treat this as a repeat-farm route and settle in. The casing is uncommon but not rare, and a steady run of casts will get you to five without any special setup.
Returning to Vega and what comes next
Once all five casings are in your inventory, return to Astronomer Vega in the laboratory and hand them over to clear the objective. This is the first stage of Vega’s questline, which builds toward a specialized telescope. The follow-up steps send you to several locations for Telescopic Lenses and Batteries. These materials power the telescope and the wider Astral Observatory systems, including the server-wide Astral Anomalies. The Battery Casings open the way to the rest of the questline.
Grab Merlin’s Chasm buff before you jump in — without it you can’t survive The Chasm to reach the Mineshaft, so the fishing never even starts.
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