Partial invisibility



A blur artifact (also known as an invisibility sphere or partial invisibility) is a powerup that appears as a floating red orb with a blue eye-like pattern. Picking one up will grant the player temporary partial invisibility. The player's sprite (as seen by other players in multiplayer mode) will be given a filter similar to that of the spectre, while the affected player will see their own weapon as partially invisible. When 5 seconds remain, the weapon will begin blinking, signaling the end of the artifact's effects; the player's sprite, however, remains filtered until all 60 seconds have expired.

Monsters firing upon an affected player will have their accuracy reduced, in that their aim is offset by a random angle, causing them to miss more often. This, however, may cause more experienced players to inadvertently dodge toward hostile fire rather than away from it. Nevertheless, a blur sphere bestows an advantage against hitscan attacks such as those of zombies or Spider Masterminds. On the other hand, the invisibility is unable to disrupt monster melee or Arch-Vile attacks (even though the monsters do appear to spin around in confusion).

Blur artifacts are included in the items percentage displayed at the end of each level.