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Tsunami is an Archaic spell that is unlocked by killing 100 Twin Sea Dragon Serpents. This spell requires a Magic level of 108 to cast and inflicts damage equal to 100% of your max hit 3 times. There is a 0.3 second delay between each of the 3 attacks for a total duration of 0.6 seconds. Each hit increases the enemy's attack interval by 20% for 3 of the enemy's turns. 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.