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Natures Bloom is an Archaic Magick spell that is unlocked by clearing Ancient Sanctuary 100 times. This spell requires a Magic level of 110 to cast and inflicts damage equal to 100% of your max hit 8 times. There is a 0.5 second delay between each of the 8 attacks for a total duration of 3.5 seconds. Each hit has a 50% chance to inflict Poison for 10% of the enemy's max hitpoints as damage over 10 seconds. This attack is avoidable. When cast, the spell also gives Regen that heals 30% of your current hitpoints over 5 seconds.
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.