| Name | Hydra |
| Category | Event |
| Cost/Life | 1 |
| Color | Purple |
| Types | Impel Down |
| Effects | Main DON!! −1 (You may return the specified number of DON!! cards from your field to your DON!! deck.): Give up to 1 of your opponent's Characters −3000 power during this turn. |
| Trigger | If your opponent has 6 or more DON!! cards on their field, your opponent returns 1 DO |
| Variants | 1 |
| Number | 90 (UC) |
| Shop |
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