Nero Kelvane was sent by Davra Jassur to accompany a group of adventurers in the Underdark in hopes they would find information and help stop the demonic activities ongoing in the Underdark.
Later on, he was sent by that same group of adventurers to accompany Sladis Vadir, a member of the Emerald Enclave who had gone insane while traveling in the Underdark.