Step 5: The Dark Tower - Tons and Tons of Pointy Things.
Note: My camera seems to have eaten several of the pictures that should go here. Basically, I used toothpicks on the forky piece, thin skewers on the top tier, and thicker skewers on the bottom two tiers. These were just glued on vertically, with points protruding at the top of the tier, for the most part.
I should mention that some of the pointy things on the bottom tier were allowed to extend lower than the base of the tower, almost as if someone planned to use them to anchor the tower in some kind of soft, cakelike substance. It's probably just a coincidence, though.