Grandine

Grandine is the artificial version of Undine, created and mass produced by Promestein.

Using the flow, Grandine makes her wielder's attacks hit multiple times. However, Grandine does not seem to improve her wielder's avoidance rate, or at least the wielder never actually tries to avoid Luka's attacks. Salamander can somehow neutralize Black Alice's one-hit KO attack "Elimination: Stroke" using Grandine, though how this works is unknown.

Summoners

 * Mermaid
 * Mermaid General
 * Queen Mermaid
 * Slime Bess
 * Black Alice (Final Form)

Trivia

 * Her name is derived from the Latin for "hailstorm", referring to how she only embodies the most destructive aspects of water.