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Infernal Power is an Archaic spell that is unlocked by clearing Underground Lava Lake 100 times. This spell requires a Magic level of 112 to cast and inflicts damage equal to 100% of your max hit (plus an additional 100% of your max hit if the enemy is burning) 4 times. There is a 0.4 second delay between each of the 4 attacks for a total duration of 1.2 seconds. Each hit has a 50% chance to inflict Burn that deals 15% of the enemy's current hitpoints as damage over 2.5 seconds. This attack is avoidable.
As with all Archaic Magicks, damage modifiers from equipment, prayer, and potions will apply. Curses and damage-modifying Auroras can also be used, though special attacks will not work.