When you enter the tower, you can go either stairs up or down. If you go down, you find a little room with some ghasts. There look for a secret door and then the fun starts.
Dont worry about the wardstones, just collect them and they will "work" for themselves. Just explore the WHOLE maps, and kill everything you find
and it will be very a funny quest
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"Let my spells do the dirty work" Ertai, High Sorceror of the Holy Flame