Darkness Energy is an Energy card. It is listed as Special.
Darkness Energy sits at 94/110 in Holon Phantoms, position 94 of 111. Before it is 93 Root Fossil, and after it is 95 Metal Energy. The set belongs to the EX series. It was released on May 1, 2006. The printed size is 110. This checklist is longer, at 111 cards. The listed rarity is Rare.
The card text says: If the Pokémon Darkness Energy is attached to attacks, the attack does 10 more damage to the Active Pokémon (before applying Weakness and Resistance). Ignore this effect unless the Attacking Pokémon is Darkness or has Dark in its name. Darkness Energy provides Darkness Energy. (Doesn't count as a basic Energy card.)
The illustrator line reads Milky Isobe. I count 22 other cards in the catalog with that illustrator.
Holon Phantoms set binder is where a full Holon Phantoms set goes. This card fills one slot there. I still need this card.
If the Pokémon Darkness Energy is attached to attacks, the attack does 10 more damage to the Active Pokémon (before applying Weakness and Resistance). Ignore this effect unless the Attacking Pokémon is Darkness or has Dark in its name. Darkness Energy provides Darkness Energy. (Doesn't count as a basic Energy card.)
Holon Phantoms, in the EX series. It was released on May 1, 2006. The printed size is 110.
94/110. It is entry 94 of 111 in this checklist.
Milky Isobe. The catalog lists 22 other cards with that illustrator.
Rare.