Gildrim, AC 15, HP 34/34
Gildrim sidesteps the snapping jaws and with a grunt hammers his sword into the ankheg's carapace.
Move to L9 to flank, reckless offense, 1d10+12=21, 2d6+5=9. Forgot all the bonuses, so only rolled 1d10+10, but there we go. Better than I thought.