Per the new GSL, how much leeway does Necromancer have with a Tome of Horrors? In other words, if they wanted to, can they add in Frequency, Ecology, or recap attacks powers in the monster summary section? Or must they adhere strictly to the current design layout of the MM as dictated by WotC?
I ask because the old Monsternomicon by Privateer Press deviated a lot from the way the MM looked, and it was flat out awesome. Change is good. If we want a carbon copy of the MM we can pick up anything from WotC.