: I think the warlocks were not aligned with the Light...
: maybe with Dark or not aligned since it says:
: "Our scouts have brought back news of an odd
: group of men who have gathered nearby. From their
: description alone, Twelve Motion recognized them as
: Warlocks from the Scholomance, ancient allies of The
: Deceiver and collaborators of the Fallen Lords."
Indeed; they could hardly have gotten a reputation as "collaborators of the Fallen Lords" unless they had fought alongside the Dark. Most likely they came along with Myrdred when Balor recruited them.
Just before "Shadow of the Mountain," the narrator describes a magical/elemental attack on Rabican's army which seems very likely to be the work of Warlocks; interestingly, though, the enemy leader is said to be the Watcher, whom you would not expect to be fielding "ancient allies of The Deceiver."