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Leviathan (Heartless)

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Oh no! The water! I'm in big trouble if I don't fetch it!
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Issues: Kingdom Hearts χ information, design

This article is about a Heartless.
You may be looking for the Keyblade, the Leviathan Gummi Ship Model or the ship.

Leviathan KHUX.png

Katakana リヴァイアサン Heartless Emblem.png
Rōmaji Rivaiasan

Type Emblem Heartless
Game Kingdom Hearts Union χ

Kingdom Hearts Union χ
This sea monster absorbs Magic attacks, ans lowers your STR while boosting its DEF. The number above it gets smaller with every hit, and it counters at 0!

The Leviathan is an Emblem Heartless found in Kingdom Hearts Union χ. It is the boss of the September 2019 Big Bonus Challenge event.


The Heartless is named after Leviathan, a recurring water-elemental summon in the Final Fantasy series.