Portunid is one of the ingredients you can find in Tower of Fantasy and it’s basically a type of crab.
You will be required to find 5 portunid in one of the side missions by Patty at Banges.
Here’s where you can find portunid (location) in Tower of Fantasy.
Where to find portunid (location)
You can find portunid all around the beach area.
From Banges Dock, go west (left). The exact location is shown in the map below, marked by the player location.
They are basically moving crabs. You’ll have to attack them to obtain them.
Just keep going around the whole stretch of the beach to find at least five of them.
Submit 5 of them to Patty during the side mission.