Um, it was always called the Convocation of Fourteen - it's number was reduced to 13 afterresigned and they simply never chose a replacement (because the Final Days occurred soon after). The Convocation never changed their name to reflect that they were down by one because they simply had more important things to worry about.Azem
And Lousioix didn't summon the Twelve literally, he merely drew on their power (hence why they simply materialized as their symbols).
Although we still don't know what the Twelve really are (and Myths of the Realm so far gives more questions than it answers), apost-Sundering creation by either the Undersundered Ascians or Venat is likely.
