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Ice Burst requires a Magic level of 70 to cast and can do damage in a 3x3 square area up to 9 targets. This spell can freeze your targets, immobilising them for 10 seconds, and is capable of hitting up to 22 (25 if you are wielding a Staff of the dead, Occult necklace or higher if wearing an Salve amulet (i) or Salve amulet (ei), and higher again if used in conjunction with the staff).
Ice Burst is the most common Ancient spell used in Castle Wars and the Fight Pits, due to its relative low cost compared with Ice Barrage, the lower level requirement, and the relatively large number of targets in small spaces, especially on crowded worlds.
Ice Burst is also a common spell in Pest Control games due to the many monsters stuck in places where they cannot move. As of December 18 2014, Pest Control gives full experience from casting spells.