The Companions received a request from a female Argonian, From-Deepest-Fathoms, to return an item called the Lexicon to a Dwemer Ruin called Avanchnzel. Naturally, the first thing Hverg thought was that her name was weird. :/
Still, he'd wanted to investigate more Dwemer Ruins after he returned Grimsever to Mjoll. This was a good opportunity.