Pause.

Pause is a challenge in Risk of Rain 2. It is completed by freeing the survivor suspended in time for 10 Lunar Coins.

Collect 11 Lunar Coins and find a Newt Altar. Pay one coin so the blue portal spawns upon charging the teleporter to 100%. Use the blue portal instead of the teleporter and head to the shop. To the right of Newt is Artificer suspended in time. Pay 10 coins to unlock Artificer.