Diana gets a friend!

CHIM-JP027 Yami no Seirei Luna / Luna the Dark Spirit
Level 4 DARK Fiend [Special Summon] Effect Monster
Cannot be Normal Summoned/Set.
Must first be Special Summoned (from your hand) by banishing 1 DARK monster from your GY.
(1) Once per turn, during your Standby Phase: Inflict 500 damage to your opponent.