Originally posted by Lord Revan
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Under such conditions, a Mind shield against Presence would have full effect, meaning that any use of Presence would be reduced in successes by the number of successes of the effect and it has no side-effects. For a power without roll I would probably give a roll for the vampire or something, but the possibility of making it a Ritual with full access to the tricks a Mage has to reduce difficulty mean that most of the time it would be reasonably strong.
For a Mind effect without such requisites I would call for more successes, using up one or two to make for the lack of understanding of the Discipline, plus having to dedicate half of the remaining successes to reduce the difficulty of the WP roll instead of reinforcing the shielding in place. That would be a proper Mind effect controlling the Mage's emotions, trying to clash with what Presence does.
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