Backfire Table for Invested Spells

One of the features of the magic system in DragonQuest is the Backfire Table.  Attempt to cast a spell with too little skill and you may end up with a backfire which can have a variety of negative effects from the mildly irritating to the completely incapacitating.  It's not easy being an adept in DragonQuest but not just adepts can cast spells.  The non-adepts can loose magic spells that have been invested in items.  These can also backfire but, to me, many of the backfire results don't make much sense in the case where the spell is cast from an item.
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