Interesting. Liked the idea of the Tower creation leading to the city's end and the quest by the Wizard-Lichs to free their torment.
Question though, would this mean that there are towers in every pocketworld? In my mind the tower(s) act as gates from one world/dimension to another. As I followed the plot I expected the characters to end up at one of these towers, not a hill. Or, is the tallest hill that dimensions version of the tower?
Pretty much everything has been said already; it's an interesting premise and a solid submission. I especially liked the writing for the internal dialogs of each character, because they really make it come alive. I actually feel bad for the wizards, though my normal inclination would be to dismiss them entirely as arrogant fools. Well done!
If Kevin Costner and Morgan Freeman can do it why not a croc?
Solid idea and an amuzing one at that...might be a shark jumper for a campaign though...once the PC realize the GM is open to launching animals at each other as form of warfare things threaten to get all Monty Python on ya.