Akleu

Transparent. Any creatures that rely on sight for making attacks have disadvantage on attacks when trying to hit the akleu. 

Avoidance. If the akleu is subjected to an effect that allows it to make a saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if he fails.

Pounce. If the akleu moves at least 20 ft. straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 17 Strength saving throw or be knocked prone. If the target is prone, the akleu can make one bite attack against it as a bonus action.

Sneak Attack (1/Turn). The akleu deals an extra 9 (3d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 ft. of an ally of the akleu that isn’t incapacitated and the akleu doesn’t have disadvantage on the attack roll.

Multi attack. The akleu makes two claw attacks. 

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 6 (1d6 + 3) slashing damage. 

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 7 (2d4 + 3) piercing damage and the target must make a dc 17 constitution saving throw or be paralyzed for 1d4 rounds.  

Uncanny dodge. When the akleu takes damage it can choose to use its reaction to halve the damage.