Phandelver and Below: The Shattered Obelisk

Boona instinctively puts a heavy hand on Bryonys shoulder as the old elf speaks....though she does not understand most of it....

"...Can you hear the shards? Can you hear their song?" Ontharyx smiles, and has a faraway look in his eyes. Nightblade's spell is beginning to lose its effects.

You only have a few moments of lucidity left before Ontharyx's mind falls back fully into the grip of the Far Realm's corruption. 

Nightblade:

Nodding to the transformed Drow and his sons, Nightblade suggests to the three, “Speak as family quickly as you will before your long journey home.  I pray you will find healing there.”  He then backs off to let them talk unless someone else interjects and wants to ask a question.

Bryony is disappointed but not surprised by the drow not knowing how to cure Fergus. She perks up at Nightblade's response. "So is it a spell? Maybe we can find someone who knows how to do it," she says hopefully.

Her hope starts to crumble again when Ontharyx mentions there being no prisoners. Boona lays a heavy hand on her shoulder, and the halfling clutches it hard. "What are you talking about?" she asks. "They brought prisoners here. My aunt is one of them. Cluster? What cluster? What are you talking about?"

But even as she asks, she knows Ontharyx won't tell her. The temporary lucidity is already fading from his mind. "We have to keep going," she says to the others. "He could be wrong. Aunt Qelline could still be here somewhere!"

A wildness returns to Ontharyx's eyes, and Nightblade feels his spell let go. He looks at Bryony. "The cluster is our friend. Perhaps you would like to feed it, little one? The cluster likes halflings, I assure you. Go and see it. And listen for the music. Listen for the songs from the Far Realm."

Yanthdel turns to Nightblade and speaks a few words in Undercommon: