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Vulnerability is a level 66 Magic spell. When cast on an opponent, their Defence level is reduced by 10%. The spell gives 76 Magic experience per cast and requires 1 Soul, 5 Earth, and 5 Water runes to be cast. The spell can only be cast if their stats haven't already been lowered, meaning you cannot stack stat reduction with multiple spells in a row.

Remember, you cannot use Ancient Magicks or Lunar spells if you are using standard spells.

Cost[edit | edit source]

Spell cost
5Water rune.png5Earth rune.png1Soul rune.png186
Combo runes
5Water rune.png1Soul rune.png5Dust rune.png191
1Soul rune.png5Mud rune.png1,096
5Water rune.png1Soul rune.png5Lava rune.png186
5Earth rune.png1Soul rune.png5Steam rune.png606
5Earth rune.png1Soul rune.png5Mist rune.png931
5Earth rune.png1Soul rune.pngStaff of water.pngAlt161
5Water rune.png1Soul rune.pngStaff of earth.pngAlt166
1Soul rune.pngMud battlestaff.png141
Main and off-hands
5Earth rune.png1Soul rune.pngTome of water.png161
1Soul rune.pngStaff of earth.pngAltTome of water.png141