The strange artefact is the helmet created through the completion of the second and third God Emissary jobs. Eight strange fragments must be collected in the second job, and you must use your god banner on four prayer altars in the third job to create the artefact. The following four prayer altars work consistently work with all players: Druid circle altar in Taverley; Zamorak altar in eastern Varrock; Tribute stone east of the Falador lodestone; Saradomin altar in the church in Lumbridge. God statues may also work. The strange artefact must then be empowered to complete the job.