Magian Mooglehood missive

Can refer to any of the following Key Items:
Magian Mooglehood missive (I) - used in A Trial in Tandem
Magian Mooglehood missive (II) - used in A Trial in Tandem, Redux
Magian Mooglehood missive (III) - used in Yet Another Trial in Tandem
Magian Mooglehood missive (IV) - used in A Quaternary Trial in Tandem
Magian Mooglehood missive (V) - used in A Trial in Tandem Revisited