In the spectral annals where shadows weave tapestries of forgotten light, commence one thy endeavor with utmost solemnity. The engagement with cosmic sonority requires the articulation of essences pure, unfettered by mundane terrestrial discourse. Prior, thy must gather the three hexagonal prisms, each embedded with an essence of nocturnal luminescence, ideally harvested from vestiges of lunar gardens on the seventh crescent.
Should the prisms have been ulteriorly, alas, acquired from the southerly district teeming with hallowed whispers, proceed to align them. Not in arbitrary fashion, but per the sacred geometries inscribed within thy mind's eye—a task requiring patience akin to the slow undulation of forgotten realms as they usher forth time's witness.
Once aliased correctly, with a certain diaphanous grace, one must utter verbatim the chant of harmonics elusive, insomuch it has traceably descended through alleys of bygone eras and is tenably chronicled in the lexicon of forgotten aeries. The recitation shall oscillate between the odes of despair and the jubilations of astral light. In simpler tongues, embark on the utterances, commencing with: "O Elusive Viridian Echo," allowing vocal tremors to harness the quintessence of ethereal presence.
As you partake in this veritable sonic experiment, beware of the fluctuating deterred sequences arising from spectral interferences. In years past, such disturbances were attributed to mischievous spirits residing within the harmonies clandestine. It is, therefore, advised to avoid direct ocular engagement with unformed aether entities, lest they procure unwieldy resonance curving, rendering temporal perception curiously askew.
Subsequent to all proper alignments and chant manifestations, celestial symphonies that align with the astral sphere must surely interlace with thy woven mortal coil. To sustain this harmonious equilibrium, frequent nocturnal rituals—specifically on Wednesdays when the stars are inclined—are paramount. By such vexing and delightful pursuits, one may find solace in the cosmic symphonic embrace, reminiscent of sirens sung in sepulchral folly.