Path of Countermagic:

Sense Magic •:
This power allows the thaumaturge to read the resonance of powers cast around them.

System: The thaumaturge must first sense the use of a power around their area with a successful Perception + Awareness roll (difficulty 7), then they spend a Blood Point and roll their Willpower against difficulty 4.

1 Success: Sensing the power's "vibe" vaguely.
2 Successes: Sensing the power's "vibe".
3 Successes: Sensing the power's resonance.

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Countermagic ••:
This power allows the thaumaturge to counter a power that is being used anywhere in their eyeshot.

System: The thaumaturge must first detect the pull of reality threads around them with a successful Perception + Awareness roll (difficulty 7). Upon succeeding the thaumaturge can spend a Blood Point and roll their Willpower against difficulty 5. The victim's successes will be lowered by the amount of half the successes scored on this roll (rounded up).

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Stiffen Magic •••:
This power allows the thaumaturge to stiffen the use of one's supernatural powers.

System: The thaumaturge must first gain some sort of familiarty with the power in question, which could be easily achieved with Sense Magic •. Then, a Blood Point has to be spent and Willpower roll (difficulty 6) must be made.