As old threats are still having their effects, new, more deadly threats emerge from the unlikeliest of places. Threats that spell doom for the X-Men. Plus: What could possibly strike terror into the heart of...Sabretooth?! And who are the Children of the Vault? Mike Carey (Ultimate Fantastic Four) and Chris Bachalo (Uncanny X-Men) take over X-Men, or at least what's left of them! Collects X-Men #188-199, Annual.