Miasmic Blitz required a Magic level of 85 and could do a maximum of 280 life points per hit. In addition, any players affected by the spell who were using either Melee or Ranged style weapons would have their weapon speed halved for 36 seconds. As with all Ancient Magicks spells, the quest Desert Treasure had to be completed to cast this spell. The spell also required Zuriel's staff, making it one of the first Ancient Magicks spells to require more than just runes to cast. Miasmic spells, along with PvP Worlds and the accompanying Zuriel's staff required to cast them, were released by Jagex on 15 October2008.
The word "Miasmic" probably comes from "miasma", the gas that was believed to be responsible for plague and other diseases in 1700 Britain which actually didn't exist; plague was more due to rats and other vermin.
"Miasmic" could also refer to the Ancient Greek word 'miasma' which referred to blood pollution from killing those taking shelter in a temple, or killing family.