Logs rest. Before being awakened the abomination's natural form is a stump, while in this form the abomination can only be detected with and investigation check of 15 while with 80ft of the abomination, or a perception check of 18 well within 140ft, the abomination will only wake up if a non-swamp native walks within 50ft of the abomination.

Log sweep. Melee Weapon Attack: +4 to hit, reach 20 ft cone., all target. Hit: 9 (2d6 + 3) [bludgeoning] damage. 

Log smash. Melee Weapon Attack: +4 to hit, reach 15 ft., 1 target. Hit: 14 (3d8 + 2) [bludgeoning] damage. 

Head crush. Melee Weapon Attack: +6 to hit, reach 10 ft circle., all targets. Hit: 16 (4d6 + 4) [bludgeoning damage] damage. (4 turn cool down)