Despite all the doubts Lith and Solus shared, she had recovered her Fury only because Bytra had given it to her after recognizing Solus as Elphyn Menadion. The Mouth had ended up in the hands of Jiera's Council and they would have never heard about it, let alone retrieved it, if not for Zoreth.
Each piece of Menadion's Set was a priceless treasure that was heavily safeguarded and whose possession was kept secret to not arouse envy and greed. Lith and Solus knew that unless a miracle happened, Zoreth and the Organization were their best bet at locating the Ears.
The Shadow Dragon wasn't aware that Lith controlled the tower but she knew about Solus' real identity and their bond. For over a year now Zoreth kept everything a secret even from the Master and gave them no reason to doubt her.
Trusting the Shadow Dragon with the search for the missing artifact wouldn't endanger Lith's and Solus' safety any more than it already was.
