[Alneyan]

According to various posters (Nagot for example, and someone else whose name I have forgotten; apologises in advance), it means Magic Duel was not working according to its formula in 2.13,and possibly in other Versions. The less skilled mage won too often, or at least managed to get a draw.

If memory serves, the formula should be as follow:
1d6 (not open-ended)+Astral level for both Astral mages. The higher score wins, and the other Mage dies. When it is a draw, both Mages die.