This Servant is a limited Servant. It is only available during special summoning campaigns. When no such campaigns are active, this Servant cannot be summoned. No plans have been revealed to add this Servant to the permanent summoning pool.
When Equipped to Meltlilith, Increases Self Quick Card Performance by 20%, Critical Damage by 20%, and lowers the parties (except self) Critical Damage by 10% [Demerit], as long as she is on the field.