According to this, Lachesis survives, at least in one version of the story.
Nanna (0)
The pregnant Lachesis (19) entrusted Delmud to Oifey and returned to her parent's home in North Thracia to protect Eltshan's wife and son. She received a cold welcome from Eltshan's wife (who despised Sigurd and Lachesis) and so left the Demon Blade Mistolteen in her hands, before leaving. Afterwards, the Empire's eyes were concentrated at Tirnanogue, so Lachesis instead escaped to Fin's location. She gave birth to Nanna in the following year and raised her together with Fin. When Nanna was 8 years old, Lachesis wished to reunite with Delmud at Tirnanogue. Despite Fin's strong warning, Lachesis made her decision and afterwards there was no news of her.
Later, Agustria was conquered and the prison camp at Silvail was liberated. Many children were held here, by order of the Loputo Sect, but they were cared for by a woman who they adored like their own mother (she had also been taken prisoner by the empire). As the commander of Agustria's liberation army, Delmud reunited with his mother here. Lachesis briefly noticed it at a glance, perhaps he reminded her of Beowolf? Afterwards, Lachesis also happily reunited with Nanna and Aless.