Alchemical Speed-Runner

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Alchemical Speed-Runner is a grandmaster combat achievement which requires the player to "Kill the Alchemical Hydra in less than 1 minute 20 seconds."

One strategy that can work is maintaining high dps with a twisted bow by not eating (getting prayers right) and using a melee/dragon claw switch on the blue phase to skip the lightning and attempting to make the initial spawn (and consequent phase changes) immediately as the chemicals come up from the ground, so you don't waste time waiting for the damage debuff to fall off. It is also recommended to use the Resurrect Greater Skeleton spell as it's damage is more consistent compared to vengeance. However, there is still plenty of RNG involved in this task, just focus on trying to get the chemical vat timing right (while not losing any attack ticks) and eventually you'll get the hits to complete it.