
As you climb the mountain in PEAK, you might run into a Tick. You might not notice the little eight-legged parasite at first, but if you notice a steady supply of Poison seeping into your system from a source you can't see, odds are you've picked up a hitchhiker.
If you're on an expedition with a group of friends, removing a Tick is a pretty simple matter. If you're climbing to the roof of the world alone, you might have to pull off a tricky bit of parkour to un-Tick yourself.