I like it! It's truly a mixture between a spear and a staff (I prefer the one at the top), mirroring the shape of Orthanc, without the cartoonish connotation of the drawing. Great conceptual solution
What is still to be worked on is probably the Númenor-related armour that the guards will be given, after the activation of the Wizard's Tower spell (together with the staff/spear). Don't worry about quality; the important thing is to get the basic idea right and clear. The Edain Team, which has recently hired a new modeller, could perfect graphics, if it's necessary.