The Whirlpool Armor is a Summoning set made with 45 Water Fragments (Dropped by Syren) and 36 Dragon Scales (Dropped by Cosmos).
Stats
Helmet: 15 Defense
Increases maximum Minions by 2.
Increases Minion Damage by 24%.
Chestplate: 18 Defense
Increases maximum Minions by 3.
Increases Minion damage by 24%.
Boots: 15 Defense
Increases maximum Minions by 3.
Increases Minion damage by 24%.
Set Bonus: You will have a buff called "Atlantean Guardian", which summons a fish-like warrior to fight on your side. Note that this does not count on your maximum minions.
Stats (Atlantean Guardian)
Base Damage: 100
Damage Type: Summon