Water Core

The Water Core is a Heartless that appears in Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage- and Kingdom Hearts III.

Kingdom Hearts III

 * Wave Attack (ウェーブアタック)
 * Water Shot (ウォーターショット)
 * Water Upper (ウォーターアッパー)
 * Cloud Drop (クラウドドロップ)

Strategy
A Water Core can be electrocuted with Thunder and frozen with Blizzard, but it takes a few shots of either to slay a Water Core.