Alithea's personal spaceship. She uses it to rescue Amyntas after he is severely wounded by the Empyrean Extermination Sequence as it destroys Acheron. Nefeli is then called to rescue Alithea when she is severely wounded after her duel with Virton at the end of Cenotaph in Andara's Will.
In Greek Mythology, Nefeli is a cloud nymph.
The Nefeli, overlooking Acheron during the Extermination Sequence