Shadow Captain tells you, "Black Ferah sent you to assist in the siege efforts?"
Shadow Captain tells you, "We are working on bringing Shadow Vortexes to the surface."
Shadow Captain tells you, "You may want to stand back. These things have a mind of their own."
Shadow Captain tells you, "As you can see, I am all set over here. However, the other Shadow Soldiers have been encountering resistance."
Shadow Captain tells you, "Go assist them and kill off anyone that tries to stop them."