Monster Hunter World Iceborne (MHW Iceborne) - Submerged Mystery Trophy / Achievement Guide - Capture a mysterious creature lurking beneath the water's surface. [Silver]

- Animal Name: Sealord's Crestfish
- Type: Fish (looks like a sea serpent with a bright dot like a "lantern" on its head)
- Map: Hoarfrost Reach
- Daytime: only at Night
- Caught With: Fishing Rod
- Rarity: Extremely Rare

You can only catch it at night in the dirty looking water of the underground tunnel area in Hoarfrost Reach. It looks a bit like a sea serpent with a bright dot like a "lantern" on its head. If it doesn't spawn, fast travel to another map and return to Hoarfrost Reach, check again at night time. It can take a few hours to get it to spawn.