So like puca and fae in mythology, keeping promises is EXTREMELY important and they will want to do so at all cost. Whenever there is a choice that would adhere to a promise they kept, they will feel a strong compulsion to do that action that'd maintain the promise (like if they promise to always tell the truth, they will feel a constant compulsion to outright say the honest answer even if it comes to their detriment.)
If characters really want to ignore this compulsion, they can do resist it with great will, but it's about as wise as ignoring the warning signs on a nuclear reaction site. Depending on what the promise was exactly, the consequences could be anywhere from:
Severe Memory Loss (permanent)
Severe power loss (permanent)
Grave misfortune (as in losing all your wealth and home level of misfortune. if character lacks those, it'd be something of equal value to them.)
Severe pain and agony (permanent)
Decline of health
Loss of a sense (permanent)
Loss of limbs (cannot be regenerated)
Generational curse upon all your family
Death
This applies whether or not the Puca had control over a promise being fulfilled or not. Basically, a Puca should absolutely not make a promise unless they are 100% sure they can fulfill it. That said, the promise rule only applies when they outright say "I promise/swear/vow to [x]" though, so they should know what they're doing when they make one.
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So like puca and fae in mythology, keeping promises is EXTREMELY important and they will want to do so at all cost. Whenever there is a choice that would adhere to a promise they kept, they will feel a strong compulsion to do that action that'd maintain the promise (like if they promise to always tell the truth, they will feel a constant compulsion to outright say the honest answer even if it comes to their detriment.)
If characters really want to ignore this compulsion, they can do resist it with great will, but it's about as wise as ignoring the warning signs on a nuclear reaction site. Depending on what the promise was exactly, the consequences could be anywhere from:
This applies whether or not the Puca had control over a promise being fulfilled or not. Basically, a Puca should absolutely not make a promise unless they are 100% sure they can fulfill it. That said, the promise rule only applies when they outright say "I promise/swear/vow to [x]" though, so they should know what they're doing when they make one.
I hope this clears things up!