Curse is a level 19 Magic spell. When cast on an opponent, their defence is reduced by 5%. The spell gives 29 experience whether it hits or misses, making it a popular way to raise experience cheaply. The spell can only be cast if his stats haven't already been lowered, meaning you can not stack stat reduction with multiple spells in a row.
Casting Curse while wearing full metal armour (including an elemental staff with no more than +10 magic points) and d'hide vambraces can give a magic attack as low as -65, which guarantees a "splash," or a missed hit. This provides very cheap magic experience, as players can instantly recast the spell on the same target. Additionally, casting Curse grants players no experience in the Hitpoints skill and, thus, is useful to pures. The usual method is to buy the Body runes needed for the cast, as well as an appropriate amount of one of the other two runes, and using the respective staff of the third rune. An expensive alternative is to buy a Mud Staff, which provides an unlimited supply of both Water and Earth Runes. Snakeskin boots are also a recommended item to bring when splashing as they give an additional -10 magic attack.
When doing this method, it is helpful to position a monster so that it is just on the edge of your screen, so that there is minimal distance between it and your spellbook.
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