Karlabos is a boss in Final Fantasy V. It pulls the party's ship into a whirlpool and attacks them while they are navigating the Torna Canal, where it had been sealed. After the battle ends and the party escapes the whirlpool, Karlabos drags Syldra into the vortex. Without Syldra to tow along their ship, the party is set adrift.
Karlabos's Tail Screw attack can reduce a character to critical condition. It can also Paralyze a character, but as long as it does not paralyze a Black Mage, everything should be fine; since it is weak to Lightning, the spell Thunder from a Black Mage should take it out quickly.
Another strategy can be executed if the party has a Blue Mage on level 5 with the Goblin Punch learned; if the character is on the same level as the enemy Goblin Punch will inflict around 240 damage, making this boss a very easy kill.