Origin

When this artifact is active 3 to 5 Purple Imps and an Imp Vanguard spawn from a portal every ten minutes.

Using the Unstable Watch will freeze the timer, spawning another portal (and thus another wave of Imps and an Imp Vanguard) for every second that time is frozen, generating a large number of potential item drops. (Note: The timer must be frozen AT a 10 minute mark, not just when the portal is spawning.)

Bandit can prevent Imps from spawning by activating his 3rd skill while portal is active.

Bugs: It seems to spawn more portals if you have low FPS. Example: With 2 FPS it spawns 10 portals.