OOC: The mastodon should be at 110N15E, unless you want him to squeeze.
Dactyl doesn't dodge, takes 45 points of damage, and dies.
A swirling dark cloud of shrapnel, 10 feet on each side, flies to 110N15E. Thousands of bladed disks crackling with electricity chops into the mastodon, causing 13-10=3 plus 5 electricity damage. The mastodon has 25 hp.
The mastodon goes first in round 438. It is not distracted by the swirling blades. (Rolled 18 Fort save)