 Thus Wei Boyang and his faithful disciple attained immortality.With an abrupt change in tone and language, the account ends with a final paragraph, which mentions Wei Boyang’s authorship of the "Cantong qi" and of another work entitled "The Five Categories" ("Wu xianglei" 五相類), criticizing at the same time those who read the "Cantong qi" as a work concerned with cosmology instead of alchemy.Several centuries later, Peng Xiao (?-955) gives a different portrait of Wei Boyang in his commentary, dating from 947 CE (trans.