It seems there is a new way to "take" individuals. Oryx would take things and essentially present them with the choice to leave their worries and fears behind, cut them out of themselves, and become strong. It looked completely different than how they are taking vex. It seems like a forced conversion. I believe this answers why it is now suicidal to take the vex. They are being taken by force, and every ounce of their being is fighting back. When Oryx took them, it was their choice. As the book of sorrows put it they took the knife, and cut out what was "holding them back". Maybe I'm completely out in left field with this. But you gotta admit at least, things aren't being taken in the same manner they used to be. Seems like a forced process.