Hydra
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 A legendary creature sent by Hades to destroy the Olympus Coliseum and Hercules.
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| Kana | ヒュドラ | ||||||
| Romaji | Hyudora | ||||||
| JP Set | 7 | ||||||
| EN Set | 5 | ||||||
| Class | Type | Attributes | |||||
| Rare | Attack | Speed | Reversed | ||||
| STR | DEF | Trait Slots | Spirit Points | ||||
| 4261 / 5348 | 4260 / 5348 | 1 | 15 / 18 | ||||
| Dark Spark Dash +4 | |||||||
| Deals 4 extremely powerful hits. | |||||||
| Damage (Base) | x2.11 | Target |  All
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| Damage (3 dots) | x2.35 | Gauges | 3 | ||||
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 A legendary creature sent by Hades to destroy the Olympus Coliseum and Hercules.
| |||||||
| Kana | ヒュドラ | ||||||
| Romaji | Hyudora | ||||||
| JP Set | 7 | ||||||
| EN Set | 5 | ||||||
| Class | Type | Attributes | |||||
| Rare | Attack | Speed | Reversed | ||||
| STR | DEF | Trait Slots | Spirit Points | ||||
| 5495 / 7131 | 5494 / 7130 | 1 | 15 / 18 | ||||
| Dark Spark Dash +5 | |||||||
| Deals 5 extremely powerful hits. | |||||||
| Damage (Base) | x2.19 | Target | All
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| Damage (5 dots) | x2.59 | Gauges | 3 | ||||
| Damage (Max) | x5.18 | SAB Tier |  3
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| |||||||
 A legendary creature sent by Hades to destroy the Olympus Coliseum and Hercules.
| |||||||
| Kana | ヒュドラ | ||||||
| Romaji | Hyudora | ||||||
| JP Set | 7 | ||||||
| EN Set | 5 | ||||||
| Class | Type | Attributes | |||||
| Rare | Attack | Speed | Reversed | ||||
| STR | DEF | Trait Slots | Spirit Points | ||||
| 8661 / 11864 | 8660 / 11863 | 1 | 15 / 18 | ||||
| Dark Spark Dash +6 | |||||||
| Deals 5 extremely powerful hits. | |||||||
| Damage (5 dots) | x7.75 | Target | All
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| Damage (Max) | x15.50 | Gauges | 3 | ||||
| Subslot | +0.005% | SAB Tier | 3
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Hydra is a Rare Attack Medal in Kingdom Hearts Unchained χ / Union χ.
Hydra was announced on March 25, 2016 via the official KHUχ Twitter,[1] and was released the same day, available from then until March 31, 2016 during the 10 Consecutive Premium Draw.[2]