Fungalophobia

Some facts -

• It doesn't matter if you get hit by [spell=81318].
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  • If you are a hunter with a pet, or a DK with a minion etc, it doesn't matter if it gets hit by the [spell=81319].
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  • The achievement wont appear when you have killed Glop, but when you turn in the quest.
  
  
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  • And just to mention, I felt like the easiest method was to just run away from the shrooms, and not "kill" them. They will despawn after ~5 seconds, and he throws new ones at you like every ~2 seconds. Try not to melee him too much, and rather use your ranged abilities.
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A simple achievement really, during the times when Glop isn't running he'll throw boomshrooms at the spot you're currently at, just make sure to keep moving because they will blow up after a few seconds. They look like tiny mushrooms on the ground.

BTW, you can only get this achievement while doing the Therazane daily, you can't get it when doing the original quest.

The random daily quest is Glop, Son of Glop which can only be picked up from Ruberick once you're revered with Therazane. It is one of the random dailys so you won't be able to get it each day.