Then Teclis is a liar and a fraud!
Cue him getting kicked out my the other high elves, revealing himself to actually be Malekiths twin!... sent forward in time...to destroy his brother...and fulfill the prophecy!
That, or he is actually SIGMAR!
What if the chaos gates started to seal themselves and magic became very rare or hard to capture/control (like light magic)?
Sent from my brain using my fingers.