Raelorasz at the Transitus Shield wants you to enter the Nexus and release Keristrasza.
1x Keristrasza Laid to Rest
Malygos has taken Keristrasza to serve as his consort!? Unthinkable!
She'll never cooperate willingly, but Malygos is a powerful aspect, and will eventually bend her will.
This cannot come to pass, [player]. I refuse to allow her to suffer this indignity.
You must enter the Nexus and do whatever is required to spare her this fate.