Leviathan Melt Purge

is a Noble Phantasm of Meltryllis in her swimsuit. 
Lambda says, "seven sins elegy (nanazai hika) is read as summer-ins elegy (natsumi hika)." A play on "summer sins" perhaps?
Fills the heavens and the earth with the sea, creating a great tsunami. Those engulfed by the tsunami are gathered together in a whirlpool,  imprisoned in drops of water, and smashed by Meltryllis imitating a dragon while perfectly fluid, reducing them to scraps of seaweed. The sea surrounding Las Vegas is a continuous evolution of this Noble Phantasm.Fate/Grand Order material IX - Meltryllis (Swimsuit)'s profile translated by Konchew
Despite its power, Melt rarely if ever uses it in battle, as its magical energy requirements are so extreme that even when empowered by three Command Spells she cannot maintain it for more than a short time without risking damage to her Spirit Origin. 
==References==
Category:Noble Phantasms
Category:Anti-World Noble Phantasms
Category:EX rank Noble Phantasms
Category:Noble Phantasms introduced in Fate/Grand Order
Category:Noble Phantasms of the Sakura Five