Leviathan: The Last Defense S01 E13 I'll Definitely Defend It!

The giant Lucasite appears in Leviatan's village again, menacing the town. Leviatan and Jörmungand are raring to go, but Bahamut has not regained her will to fight. Telling her they believe she will come, Leviatan and Jörmungand leave Bahamut to fight.