The She-devil of the so-called Arch-Witches says that they decided you're an interesting individual, for good or worse. Expect to start receiving quests from them; do not expect any rhyme or reason to these quests. These quests will usually have racial constrictions regarding your crew, will disallow use of craft or combat vehicles and will expire in 48 hours. If you skip or abort such a Quest, the Witches will laugh at your weakness. But despite that, it might be better to approach the Witches and try to learn more before rushing in.