Zone Boss

Each Abyssea Zone has a Boss.
Beating them has rewards.
When you've beaten the 1st and 7th of the 9 you receive a Lunar Abyssite, totalling up to two, and are able to infuse another Atma of your choosing.
Abyssea - Altepa - Bennu
Abyssea - Attohwa - Itzpapalotl
Abyssea - Grauberg - Amphitrite
Abyssea - Konschtat - Kukulkan
Abyssea - La Theine - Briareus
Abyssea - Misareaux - Cirein-croin
Abyssea - Tahrongi - Glavoid
Abyssea - Uleguerand - Resheph
Abyssea - Vunkerl - Sedna