Blue slaad (barbarian features)

Magic Resistance. The slaad has advantage on saving throws against spells and other magical effects.

Regeneration. The slaad regains 10 hit points at the start of its turn if it has at least 1 hit point.

Reckless onslaught. The slaad gains advantage on all attacks this round, however, until its next turn all enemies have advantage on attack rolls against it, and it has disadvantage on all saving throws not dependent on strength.

Multiattack. The slaad makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) piercing damage.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage. If the target is a humanoid, it must succeed on a DC 15 Constitution saving throw or be infected with a disease called chaos phage. 

Advantageous attack. When an enemy misses a melee attack against the slaad, it can use its reaction to make an opposing strength check against the enemy, grappling them if successful.