So here I was, staring at Caliban’s chassis blueprint, feeling pretty smug. I’d survived The New War, danced around Sentients, and hoovered up Anomaly Shards like candy. Then I saw it: 10 Mortus Horns. Ten. I had zero. It turns out, this isn’t something you can just farm by shooting things. Nope, I had to go fishing.

Let me tell you, as someone who usually treats the Plains of Eidolon like a drive-thru for bounties, the idea of standing still with a spear felt... weird. But Caliban’s a sentient-hybrid, and I wanted that creepy-cool frame, so off I went.

The first thing you learn is that Mortus Horns don’t drop from battle. They come exclusively from the Mortus Lungfish, a creature that treats the Plains’ freshwater ponds like its own private lounge. I wasted a whole afternoon killing enemies near Gara Toht Lake, thinking maybe a fish would flop out. Spoiler: they don't. The game just sort of... smirks at you.

So I geared up properly. First, spears. The Lanzo or Peram spears work best—they’re clean, effective, and won’t make you feel like you’re trying to harpoon a Grineer dropship. I grabbed my trusty Lanzo because it feels like a classic, you know? Next, bait. You’ve got options: Peppered Bait if you’re coming during the day, or Twilight Bait if night has fallen. Mortus Lungfish are surprisingly chill about time; they spawn day and night, though they lean slightly more nocturnal. I showed up at sunset, that golden hour when the Plains look like a painting, and tossed out Twilight Bait just to be safe.

Now, location is key. These are freshwater fish, so don’t bother with the coasts. I made that mistake once and stood there like a lemon until I realized the water was salty. Head inland. The Twin Horns near Cetus are perfect—right by the gate, so you don’t have to run through a battalion of Vomvalysts. Another great spot is The Ribs, in the northwest corner of the map, where the water sits still and deep. I plonked myself between those two massive skeletal structures and waited.

Here’s where it gets... meditative. You throw in your bait, splash some Luminous Dye so you can actually see the fish, and then you stare. And stare. The dye creates these glowing spots that make the fish look like little underwater ghosts. I actually found the rhythm kind of soothing. No gunfire, no alarms. Just me, the spear, and the occasional buzz of a passing Dargyn that I studiously ignored.

One thing I absolutely love? Every single Mortus Lungfish, whether it’s a tiny fingerling or a chunky trophy, gives exactly one Mortus Horn. That’s right—no RNG on size. You don’t have to sweat if you only see small ones. I mean, I still did a little dance when I speared a big one, but that was purely for the drama. Catch ten of them, any size, and you’re golden.

After you’ve got your squirming haul, head back to Cetus. Find Fisher Hai-Lunk—he’s the guy who’s just as excited about fish as a kid in a candy store. Trade in your Lungfish, and he’ll hand over those Mortus Horns. Any extra fish can be converted into standing or saved for later. I ended up with enough standing to buy a blueprint I’d been ignoring for months, so that was a nice cherry on top.

Honestly, the whole process felt less like a grind and more like a little side quest. Warframe often throws these curveballs that force you to slow down, and I think that’s part of the charm. In 2026, with all the new story beats and expansions we’ve gotten since The New War, it’s easy to forget the simple things. Fishing for Mortus Horns reminded me that even a space ninja needs to chill by a pond sometimes. So if you’re chasing Caliban, don’t stress. Grab a spear, find some glowing water, and enjoy the quiet. Just watch out for the Eidolon that still roams at night… it got me once, and let’s just say my fishing trip ended abruptly.

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