If you don't know where to find Sealord's Crestfish in Monster Hunted World Iceborne, don't worry because here we will tell you everything you need to know.What is the achievement Submerged Mystery of Monster Hunter World Iceborne.This is a secret achievement where you will have to complete the mission "Capture a mysterious creature that lurks beneath the surface of the water". How to find Sealord's Crestfish in Monster Hunter World Iceborne.This fish can only be found in frost range at night, in the group of area 8. It is quite large so it should not be complicated to spot. The complicated thing is to catch it.To catch it you will have to pass some mini-games and try not to scare it. Given the time it may take to find the fish, we recommend not to scare it or try to catch it if you are not prepared.