Whenever a Pokémon damages 1 of your Pokémon, reduce that damage by 30 (after applying Weakness and Resistance). This power stops working if you have more than 1 Unown [D] in play. (This power works even if Unown [D] is Asleep, Confused, or Paralyzed.)
Their shapes look like hieroglyphs on ancient tablets. It is said the two are somehow related.
This is one of only three Neo-era Unown cards whose Pokémon Power's name is not the same as the word associated with that particular Unown in the Unown Mode. (The word associated with Unown D in the games is "Direct".) The other two Unown to share this trait are Unown M and Unown N.