Achelous

Achelous is a fiend in Final Fantasy X. It is encountered in the water of the Mt. Gagazet caves. Being a water-based monster, it is vulnerable to Lightning attacks. After being physically attacked, it will begin to charge and on its next turn will unleash Sonic Wave on the party. If Achelous is put to Sleep while glowing it will have to charge again.

Related enemies

 * Phlegyas

Final Fantasy X-2

 * Deep Haizhe
 * Haizhe

Etymology
In Greek mythology Achelous was the deity of the largest river in Greece.