Everything

A high-stake deception may demand a more complex solution. In this case, the liar and the truth-seeker perform a resisted roll, and the winner gets the desired result.

Generally, a believable lie is far easier to accept than one that taxes the target’s suspension of disbelief. And so, a liar who’s telling a subtle falsehood will have a lower base difficulty than one who’s pushing the envelope. The credible lie (“The NSA has a thick file on your activities”) will have a base difficulty of 4 or 5, while an incredible one (“Oprah Winfrey is a Satanic clone assassin”) would be more like difficulty 8, 9, or even 10. The Subterfuge rolls and their magickal enhancements get applied to this base difficulty. And so, the liar is better off telling something that’s easy to believe than she is when she’s trying to use magick to push a real whopper.

For the truth-seeker, the difficulty of penetrating the liar’s deception is, once again, that liar’s Willpower Trait.

In either case, the lie-detection Effect is coincidental unless the mage is painfully obvious about using magick in order to penetrate the lie. Gazing deeply into the liar’s eyes before coming to a conclusion is coincidental; conjuring Beelzebub, the demon prince of lies, in order to get the results would be vulgar.