Magic swords have a 1-in-6 chance of being cursed.

Cursed swords bind to the mouse who first holds them, and cannot be removed from the mouse’s inventory.

While the curse remains, the sword has no beneficial power. Once lifted, the sword regains its power.

d6	Curse	Lifted by...
1	Roll critical damage saves with Disadvantage	Making a selfless sacrifice in a life or death situation
2	When you gain an Exhausted Condition, gain another	Trading places with a poor farmer for a season
3	Make a WIL save to not attack when threatened	Making lasting peace with a mortal enemy
4	Reaction rolls are made with -1 modifier	Giving away everything you own, no cheating
5	If you see an ally take damage, take a Frightened Condition	Fulfilling a mouse’s dying wish
6	Spells cast in your presence always mark usage	Destroying an owl sorcerer’s source of power