Force of a Great Typhoon is an achievement that requires the player to defeat Masuta the Ascended in the Temple of Aminishi without any stacks of the calm waters effect.

The "Calm Waters" effect is applied when a player is within 3 spaces of a thrashing water which is destroyed on the same tick. This reduces Masuta's magic attack in the final phase, and as players will have no stacks when completing this achievement, it will deal heavy damage even through prayer.

This achievement can not be obtained in story mode.


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