A blur artifact (also known as a partial invisibility sphere) is a powerup that appears as a red floating orb with a blue eye-like pattern. Picking one up will grant the player temporary partial invisibility. The player's sprite 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, will remain affected until all 60 seconds have expired.
Enemies firing upon the player will have their accuracy 'reduced', in that their attacks will be offset by a random amount, causing them to miss more often. This offset, however, may cause more experienced players to inadvertently dodge into their fire rather than away from it.
| Game | ITYTD and HNTR | HMP | UV and NM |
|---|---|---|---|
| Ultimate Doom | 23 | 23 | 23 |
| Doom II | 26 | 26 | 26 |
| TNT: Evilution | 23 | 22 | 22 |
| Plutonia | 11 | 11 | 11 |