HP: 10,000
Maelspike is one of the few underwater fiends that you can battle (and capture) for the Monster Arena. Because you fight them underwater, only Tidus, Rikku, and Wakka will be able to participate in the battle, which limits the number of strategies that you can use to defeat them. That said, they are very easy to defeat.
Maelspike can be hit with the Darkness status effect, so you can have Wakka use his 
Dark Attack on it to greatly reduce the amount of damage it can deal.
| Ability | Description |
|---|---|
 Sensor |
“Watch out for Maelstrom.” |
 Scan |
“The more you attack it the sooner it casts Maelstrom. Immune to water and weak against lightning. Darkness and poison are the way to go.” |
Steal:
Water Gem (x2) (common)
Water Gem (x3) (rare)
Drops:
Mana Sphere
Location
You can only find them in the underwater sections of the Mt. Gagazet Cave exclusively. Find the part of the cave where your party members are required to swim, and you will encounter them regularly.