The magic system is highly detailed with many spells and magic items, all of which interact in a fairly complex way. We have tried to make sure there are no obvious contradictions, but with so many different items and spells it is inevitable that confusion will occasionally arise.
Situations liable to cause the most confusion are where contradictory absolutes are involved - a magic item which automatically wounds is used against a magic item which always saves. If you find you have two equal claims in this way, the magic is judged to be of equal potency, so that sometimes one side's magic will prevail and sometimes the other's. So, each side rolls a D6 and the highest scorer prevails on that occasion.
When rolling off as described above no precedent is set by the result. The next time the same situation occurs the result might equally well go the other way.