Master Gregory has been known by his apprentice, Tom Ward as 'the Spook' and despite there being many Spook's in the series, Master Gregory is always the one to be primarily referred to in the term. The Spook has became one of the most recognised Spook's and has assisted in conquering many ancient gods including the Ordeen. The Spook specialises in Witches but also binds Boggarts, helps Ghosts move on and most importantly trains his apprentice Tom. Twenty-nine apprentices have come before Tom and few have made it, Tom is his last apprentice.