To spawn the Ancient Depth Serpent in Fisch, go to The Depths and wait for the Absolute Darkness event. When the message “The depths have grown darker” appears, look for a small glowing yellow/gold patch in the water and fish there; that’s the spawn zone.

What to do

  1. Reach The Depths first, which is accessed through Vertigo using a Depths Key.
  1. Wait for night and the Absolute Darkness event.
  1. Watch for the notification “The depths have grown darker”.
  1. Find the bright gold/yellow glowing spot in the water.
  1. Fish there; using Fish Radar makes the spot easier to track.

Helpful tips

  • Truffle Worms are commonly recommended as bait.
  • A rod with good Luck and Resilience helps.
  • Some guides suggest using Sundial Totems to extend nighttime and give yourself more attempts.
  • The spawn window is short, so stay alert once the event starts.

Important distinction

The serpent does not spawn everywhere in The Depths; it appears in a random abundance spot during the event. That means the key is not just being in the area, but catching the event and then locating the glowing patch quickly.

TL;DR: Get into The Depths, wait for Absolute Darkness , then fish the glowing gold spot when “The depths have grown darker” shows up.