Sir Jon

Sir Jon, or Sir Jon the Second was a character in the original Mystries of the Rift before he was cut out of the revised story.

Reasons for the Cut:
He was latter cut out for three reasons: One, his character had no reason to be in the plot; Two, when the cast of Mysteries of the Rift tried to find an actor for him, the actor would end up bailing out; and three, he was a horrible character that had no personality other than being annoying. So, Rest in Peace Sir Jon. No one likes you and no one ever will, ever.

Paying Homage to Sir Jon:
In the revised Mysteries of the Rift, in chapter two, there is a swordsmaster named simply "Jon", who later dies at the hands of a huge Shadow Assassin attack party on the Sayar Alimundi Academy of Sword Arts. It can be guessed that Darren Olah put "Jon" in there as an inside joke or reference for anyone familiar to the original Mysteries of the Rift lore.