Quote:
Originally Posted by evileeyore
-5 to -10% sounds rightish to me.
But in Dresdenverse Thresholds don't just slow/stop the beings and mages from entering, but act as a shield against magic spells as well (though this isn't often reflected in the series as much as it's just discussed at one point).
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True, but that's already accounted for in the 'Safe as Houses' article, in the last bullet point on p. 6.
Personally, instead of a Quick Contest of Will+Magery against effective Threshold Rating for every spell (and on lost contests, suffering a penalty of margin of failure), I might opt for a quicker and easier solution of just a flat penalty based on TR.
I think I want thresholds of ordinary homes to be more significant and important, even against powerful beings, than the article assumes, so I might make the penalty more significant than the relatively small margins of failure that anything with Will 12+* will tend to end up with against thresholds with TR 9-12.
So I might give a penalty of (Threshold Rating - 6) on attempts to use hostile magic against characters protected by a threshold. I'd use the same penalty on
all uses of magic by wizards or other supernatural beings who enter a threshold uninvited, lasting until they leave.
I'd also allow fairly simple wards to improve that penalty to 2 x (Threshold Rating - 6), probably just using Lesser Strengthen Magic. It would be something all ritual mages did regularly and represent basic wards from the novels.
That effectively makes a normal threshold (TR 9-12) all but impervious to sent magic by anyone but vampire lords, fallen angels or archmages, as it imposes a -6 to -8 penalty to workings that affect the protected beings.