You're hired to this assignment by moogle called Sorbet. He works in moogling at the West Gate of Rabanastre. He says that Old Dalan asked his brother to repair an Old Key to sluices in Garamsythe Waterway, but it got stolen by a white flan. This hunt is pretty important because after you complete it you will get that very key.
About 66 000 HP
Resistant to Libra
This enemy can be found in south-western part of Garamsythe Waterway (entrance through warehouse No 5 in Lowtown).
He uses Waterga, which deals water damage to everyone in range, Slowga, which slows down everybody in the range and Toxify, which poisons every one in range. He uses the ordinary attack pretty seldom - he uses mostly Waterga.
Send two characters to attack and leave one healer with long ranged weapon in the back. He'll have to handle bad statuses and healing of course. He may attack from time to time if he doesn't have anything better to do.
Bounty: 2800 gil, Yoichi Bow, Sluice Gate key.