The last legion that had not shown itself was the Ghost Wolf Legion.
Compared to the other Undead legions, the Ghost Wolf Legion was rather special, stemming from the innate talents of the Ghost Wolves.
They possessed the ability to spatially teleport, shifting a small segment of space, and upon evolving into the Epic Boss template, their abilities were enhanced, allowing them to carry a few people or objects along with them.
Edward naturally understood the characteristics of the Ghost Wolves, which was exactly why he had kept the Ghost Wolf Legion, along with the Dark Knights and Bone Dragons, in reserve.
This siege against the international team was something Edward had prepared for from the start; he planned to confront the enemy head-on with the Bone Dragons, while having the Ghost Wolves transport the Dark Knights one-on-one into the enemy's formation for assassinations.