Abominable Strength. the Abomination will have advantage on all strength based checks and saving throws.

Undead Fortitude. If damage reduces the Abomination to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the Abomination drops to 1 hit point instead.

Charging Slam. the Abomination may take the charge attack action and then immediately  take the slam attack action.

Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., # target. Hit: 2 (2d10 + 6) bludgeoning  damage. 

Bite. Melee Weapon Attack: +4 to hit, reach 3 ft., 1 target. Hit: 1 (1d8 + 6) piercing  damage.

Charge. Melee Weapon Attack: +4 to hit, reach 20 ft. 1 target. Hit: 1 (1d10 + 6) force damage and knock the target back 5 ft and knock it prone.