2 added 2nd and 3rd paragraphs
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Suppose you want to compel aspects. If at all possible, I recommend tying in to the PCs' existing aspects. You don't need to create a new aspect on Boromir when he already has Absolute Confidence in his own willpowerGondor. Compel the PCs where they're weak, or forFor maximal style points, compel the PCs where they believe they are strong. Whatever aspects they've been invoking, let the ring twist and compel. (And wraith808 is right: When you can't find anything to compel, Incite Emotion.)

If that failsAs an alternative to compelling aspects, Incite Emotionyou could get clever and try to corrupt the players. DFRPG provides a mechanic named "sponsor debt," whereby players can gain a free benefit now in exchange for a forced compel later. (If you buy it off then, it comes back twofold.)

Or if you want to really drive home the Ring's power to fragment a group, let it grant its bearer power at the Fellowship's expense. When the One Ring helps you, the GM receives a special Fate Point that can be spent against the rest of the Fellowship.

If at all possible, I recommend tying in to the PCs' existing aspects. You don't need to create a new aspect on Boromir when he already has Absolute Confidence in his own willpower. Compel the PCs where they're weak, or for maximal style points, where they believe they are strong.

If that fails, Incite Emotion.

Suppose you want to compel aspects. If at all possible, I recommend tying in to the PCs' existing aspects. You don't need to create a new aspect on Boromir when he already has Absolute Confidence in Gondor. For maximal style points, compel the PCs where they believe they are strong. Whatever aspects they've been invoking, let the ring twist and compel. (And wraith808 is right: When you can't find anything to compel, Incite Emotion.)

As an alternative to compelling aspects, you could get clever and try to corrupt the players. DFRPG provides a mechanic named "sponsor debt," whereby players can gain a free benefit now in exchange for a forced compel later. (If you buy it off then, it comes back twofold.)

Or if you want to really drive home the Ring's power to fragment a group, let it grant its bearer power at the Fellowship's expense. When the One Ring helps you, the GM receives a special Fate Point that can be spent against the rest of the Fellowship.

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If at all possible, I recommend tying in to the PCs' existing aspects. You don't need to create a new aspect on Boromir when he already has Absolute Confidence in his own willpower. Compel the PCs where they're weak, or for maximal style points, where they believe they are strong.

If that fails, Incite Emotion.