Hydreigon (Steam Siege 86/114)

Pokémon · Stage 2

During your opponent's next turn, any damage done by attacks from the Defending Pokémon is reduced by 40 (before applying Weakness and Resistance).

Discard as many Darkness Energy attached to your Pokémon as you like. This attack does 50 damage times the amount of Darkness Energy you discarded in this way.