sacrifice Horn and Machine Fish to summon Sea Fortess.
Effect: This card is used to Ritual Summon "Fortress Whale". You must also Tribute "White Dolphin", "Mech Bass" and "Misairuzame" from your field.
Order by:
Fortress Whale's Oath can be summoned by fusing following cards combinations.
Fortress Whale's Oath is used in the following rituals. Three specific monster cards must be placed on the field and then ritual magic card must be activated in order ritual to work.
SPELL
Magic Ritual
10
Drops S-TEC / A-TEC