Veiled Charybdis

Veiled Charybdis is an Apex fish that lives in the Obsidian Trench and takes Meteor or Stag Beetle bait, at night. The wiki marks it as tradable and appraisable. Its first phase plays like a regular Apex Charybdis: erratic movement, -95% locked progress speed, and a roar instead of the usual chime when it bites.

The real change comes with Phase 2. Progress is set to 25% and a -60% forced, true progress speed applies. A second bar fills with every gain and drains with every loss, and if that bottom bar fills, the fish pulls you into the water and eats you. Blue vortexes appear on the minigame and drag the control bar toward them; touching one reduces your control and speeds up the bottom bar. Only one vortex exists at a time, though it can vanish and respawn at once.

You cannot land it with the Tranquility Rod or Bellona's Waraxe. The game text calls it a colossal vortex given form, once a goddess cursed to hunger eternally, whose swirling maw still consumes ships, storms and even the sea.