RD/KP11-JP044 ヴォイドヴェルグ・テュルフィング Voidvelgr Tyrfing
Equip Spell Card
[REQUIREMENT] You can equip this to 1 face-up DARK Galaxy monster you control.
[EFFECT] The equipped monster gains 400 ATK and its attacks pierce.

Note: Tyrfing is a magic sword from Norse Mythology.

Source