Anomalous Creation addon - S.T.A.L.K.E.R. Anomaly mod for S.T.A.L.K.E.R.: Call of Pripyat
When a mutant dies in an anomaly, there is a chance for an artifact to spawn.
Laoshi Moddb Perk Based Artefacts Configuration Menu Dynamic Mutants Stalker Anomaly Mod For Call Of Pripyat Nomalous Creation
Source: moddb.com