You must roll your current Body Points score or less on two movement dice or you will lose one Body Point. If you fail, roll again the dice, until you can break the chain or die horribly!
This currently would spell almost certain death for a full health wizard let alone an injured one... To balance things out perhaps allow it to include mind points some how...
Either because the wizard has the mental capacity to remain calm and recall an ancient scroll he once read regarding such an amulet... And if you press here just right....
So either "you must roll under the sum of your current mind and body points on 2 red movement dice"
Or perhaps adding "before rolling for any attempt you may spend mind points to reduce the result of the dice roll by the number of mind points spent"
Also currently each fail means it is more likely to fail again... So if you miss 1 or 2 attempts odds increase it will kill a character out right - thematically it makes sense... But I question the fun of such a mechanic. The mind point spending fixes both problems, but it comes down to just how deadly you want it to be....