Hollow. This word completely describes the dragon.
Ability / Effect
[Call Cost] [Pay 2 gauge & Put a card from your hand into this card's soul] When this card enters the field, if your flag is "Legend World", put two cards from your opponent's gauge into his or her drop zone, and if your flag is "Star Dragon World", deal 2 damage to your opponent! "Gravity Rest" When a monster enters your opponent's field, you may pay 1 gauge and discard a card from your hand. If you do, [Rest] that monster. [Soulguard]