Oh, and if the Cornugon is still up after my attacks, it has to make a Fort save against being Stunned for 1 round, DC 28 or higher (+1 to DC for each hit I landed past the first two successes). It gains a +5 bonus to its roll since it is normally immune to fire damage. Besides that, it also takes 2d6 Dex drain for each successful hit with my main-hand weapon (rolling 3 times because one was an automatic miss):
Dex drain 1 2d6 : 5, 4, total 9
Dex drain 2 2d6 : 6, 1, total 7
Dex drain 3 2d6 : 1, 1, total 2