Unseen Forces is a set in the EX series. It was released on August 1, 2005. The printed size is 115. This checklist is longer, at 145 cards. Darkness Energy is 96/115, in position 98 of 145 on this checklist. Before it is 95 Potion, and after it is 97 Metal Energy. The listed rarity is Rare.
Darkness Energy is an Energy card. It is listed as Special.
Milky Isobe illustrated this card. The same name is on 22 other cards in the catalog.
The card text says: If the Pokémon Darkness Energy is attached to attack, 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.)
I keep a set binder for Unseen Forces, meant to hold every card of that set. This card is one slot in the Unseen Forces set binder. I still need this card.
If the Pokémon Darkness Energy is attached to attack, 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.)
Unseen Forces, in the EX series. It was released on August 1, 2005. The printed size is 115.
96/115. It is entry 98 of 145 in this checklist.
Milky Isobe. The catalog lists 22 other cards with that illustrator.
Rare.