(Excerpt from the Medinaat al-Salaam section of the LBS RPG)

Curses
The opposite of Blessings, Curses draws forth the potential any being carries within it to fail, stumble, or lose its stride. Typically cast upon ones enemies, Curses are the most common offensive magic used in the Jewel. A specific task can only suffer from a single Curse at a time, but a Skill can be the target of any number of Curses.

Mastery Level 1.The first Curse a sahir can lay upon a target reduces their chances of success, as they make poor decisions and constantly fail to remember their training. You select a single task, usually tied to a Skill, when you cast this spell. For each Roll of the chosen Skill involved in accomplishing the chosen task for the next hour, the target of the curse suffers a -2k0 penalty (to a minimum of 1 rolled die).

Mastery Level 2. As with the second Blessing, the effect intensifies. For each Roll of the chosen Skill involved in accomplishing the chosen task for the next hour, the target of the curse suffers a -2k1 penalty (to a minimum of 1k1).

Mastery Level 3. The third Curse is amongst the most feared, because it can sap the competence of a being with only a barked command. You may now cast the Mastery Level 1 and Mastery Level 2 spells as a Simple Action.