The entire battle would last close to an hour, from the first charge, to the extermination of the last fae creature; fortunately, they didn't make any efforts to hide, but they did scatter, if they made it through the walls. And there were enough of them that a few would make it through, and rampage through the city, for a short while.<br/><br/>As the last one falls, the tower vanishes in a storm of green energy, a mournful wail crossing the city along with it. At its base, a perfectly round patch of barren sand a hundred feet in diameter; a patch of sand at the heart seems to be the 'key', like the other items.