Pause

Pause is a challenge in Risk of Rain 2. It's objective is to "Free the survivor suspended in time".

How to Complete
Start by collecting at least ten Lunar Coins. This may take time but should not be too difficult since Lunar Coins persist between runs.

Next, you need to travel to the Bazaar Between Time, which can only be accessed by luck or spending another Lunar Coin at a Newt Altar (which can rarely appear in any level/area, but will require collecting eleven total) before activating the Teleporter. In either case, the message "a blue orb has appeared..." should appear in the log, and a small blue orb will be visible around the central altar of the Teleporter. After charging the teleporter and defeating the boss, a Blue Portal will appear next to it; interacting with the portal takes you to the Bazaar.

Finally, in the Bazaar, interact with the crystal next to the giant newt. This costs 10 Lunar Coins and is labeled "Free the Survivor". This completes the challenge and unlocks the Artificer.

Do note that in multiplayer lobbies only one player can complete the challenge and unlock the Artificer at once. The unlocking player need not be the host (or the purchaser of the initial portal), and the unlock is available even if the host already has the Artificer unlocked on their account.