The Lugia Shrine is a block that allows you to spawn Lugia if requirements are met. You will need a Orb of Static Souls, Orb of Fiery Souls, and Orb of Frozen Souls that are all fully charged by killing 375 Pokémon of the respective types. A Melody Flute is also required. Once all requirements are met, right-click the shrine with all charged orbs, followed by the Melody Flute. After a short tune, Lugia will be summoned.