The Rune

Clary and Jace are engaged and Clary dreams of a new rune. When she draws it, she manages to portal herself and Jace into a possible future, where they can see their future selves, and their future friends--even their future children! What will fourteen years ahead have in stock for them?

Apparently, it holds shattered wards, a demon invasion, and a whole lot of trouble. Will the two of them be able to return to their time alive?