Cephadrome

Submerged. This creature doesn't provoke an opportunity attack when it moves out of an enemy's reach. (When burrowed)

Sound-Sensitivity. Whenever underground and a sonic bomb is used it will resurface and be stunned until the end of its next turn. Once this has occurred roll a d4, it takes that many rounds until it can be stunned again.

Keen Hearing. Cephalos has advantage on any wisdom(perception) checks relying on sound.

Multi-attack. The Cephalos makes two-tail attacks.

Tail. Melee Weapon Attack: +6 to hit, reach 10 ft., 1 target. Hit: 10 (1d6 +3) bludgeoning damage. On a successful hit, the targeted creature is pushed back 10 ft and makes a constitution save DC 12 or is blinded until the end of its next turn.

Hip-Check. Melee Weapon Attack: +6 to hit, reach 10ft., 1 target. Hit: 11 (1d12 + 3) bludgeoning damage. the targeted creature must make a strength, or dexterity(targeted creature's choice) DC 15 or fall prone.

Sand-Spit. RangedWeapon Attack: +4 to hit, range 30/40 ft., 2 targets within 5 ft. Hit: 7 (1d8 + 3) bludgeoning damage. the targeted creature makes a constitution save DC 14 or is blinded until the end of its next turn. 

Dive(Burrowed). Melee Weapon Attack: +3 to hit, reach 15ft., 1 target. Hit: 10 (2d6 + 3) bludgeoning damage. 

Sand Dive. The Cephadrome burrows into the ground and does hide action. When underground it can choose to jump out of the ground and do a Sand-Spit attack. It can choose to jump out where a creature is, if so the creature must make a dexterity save DC 13 with advantage if the creature succeeded on a perception check, on a fail the creature receives 1d10 bludgeoning damage and goes prone.

Emerge. The Cephadrome unburrows itself from the ground.