Fate of the Norns

I'm thinking about borrowing something from D&D and having my players deal with a geas spell. For those who don't know, a geas is a spell that creates a compulsion to do something commanded by the caster (e.g. kill this monster, steal that object etc.). In D&D the players usually have a chance to resist the effect of the spell with a saving throw, but I'm not sure how exactly to translate that to FOTN:R. Here's what I've been considering:

1. The players can attempt a group check, maybe just a general spiritual check, against the spell.
2. Same as above, but on an individual basis.
3. There's no save, but the players can make an Ultimate Sacrifice +1 to knowingly disobey the geas.

Do you all have any thoughts or suggestions on how to handle this mechanically? Is there a spell that does this in FOTN:R that I'm forgetting? My goal is to be fair and not railroad my players, while still providing a challenge. Thanks!

A Druid of mine put a similar enchantment on the Dweller group in my game. I'll reply more in the next day or so!

For now, though, I can say that after a certain Grace period, every day that they didn't do something towards achieving the goal of the Geas, they gain a +1 Intensity in the Curse Condition.

That's a good way to handle it. What are the effects of the curse in your game?

More or less, each day that passes during which the Dwellers do not do something to progress their quest, the Curse Condition increases by 1. They can spend two Spiritual Runes to ignore its effects for one day (but that day still counts towards the 'total' for purposes of the Condition's Intensity.)

For every Intensity, the Curse's effects are as follows:

Day Effect
1 Destiny - 1
2 Destiny - 2
3 Essence - 1
4 (Max) Essence - 2

All of the above effects are cumulative.

Charm
Denizens of the North page 285

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In retrospect, I would probably combine the Charm as Andrew posted with my Curse.