To unlock Mizutsune, you need to be Hunter Rank 21 or above, have beaten the main story campaign of the game, and reached High Rank. Once you hit that rank, go to the Scarlet Forest and talk to Kanya, the fisher. You can find her in her usual spot by the pond in the Scarlet Forest basecamp.

Our Monster Hunter Wilds Mizutsune quest guide explains how you can start the new Mizutsune quest and how best to prep for it.

You know the drill: as soon as Alma authorizes a hunt, you’re good to dive right into battle and put Mizutsune down.