Each time they spellburn, they roll a d4 to see what happens.
Both have rolled "4" meaning "You invoke dark Chaos magic for your spell to work and are corrupted. If you spellburn again before any agent of Fates, your life will surely be forfeit."
Now, of course, the sisters are not going to kill one another. But they spellburn aggressively, and there must be costs.
So I was thinking of some reasonable consequences.
One would be for the sister who sees the other become and agent of corruption, the witness loses the ability to spellburn until it is rectified.
The problem with this is the only way out if for the sisters to kill one another.
Another option would be for the spellcasting sister to take a Corruption with no buying out of it with Luck, with failure to do so resulting in no spellburning, or a loss of Patron spells. Not sure about this.
Another would be stripping the witness Agent of the Fates of her ability to cast patron spell and double spellburn costs until and unless the corrupted caster willing takes on a Corruption to atone for resorting to chaos magic.
I want to be fair and in the spirit of the rules, but I also must be firm. Magic comes at great cost.
Input appreciated!
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