A hidden but extremely short quest that gives out 20 Primogems and a Strange Part. You just need to accompany a Melusine to fish in the village.
Rewards: Primogem x20, Mora x26500 & Strange Part x1
➥ Teleport to Merusea Village and head southwest towards the back of a huge rock to find Iara. Talk to her to start the hidden quest.
➥ All you need to do is spread the bait at the marked location and wait for a few seconds.
➥ When the Ball Octopus appears, defeat it to complete the quest. Yes, that’s all.