[2] He wrote a Latin chronicle of Reichersberg covering the years 1167–1195.
This was a continuation of the annals of Gerhoh of Reichersberg, whose political and ecclesiastical ideas are reflected in Magnus' work.
He incorporated into his chronicle the diary of Tageno, a copy of which was sent to him from the Holy Land; a letter from Bishop Diepold of Passau; an anonymous letter to the master of the Knights Hospitaller in Italy, Archembald, about the battle of Hattin; and a letter by Terricus, preceptor of the Knights Templar, and a survivor of Hattin.
He also made use of an early draft of the History of the Expedition of the Emperor Frederick.
[2] The first continuator records Magnus' date of death.