Broodlord

Synapse. If the Tyranid is within range of a synapse node creature it gains advantage on all charisma savingthrows, +1 to their damage roles and immunity to the charmed condition

Brutal critical. can roll one additional weapon damage die when determining the extra damage for a critical hit with a melee attack.

vicious insight. All Tyranid creatures within 15ft of the broodlord have the brutal critical ability 

multiattack. The broodlord makes makes two attacks with its claws and talons 

Hypnotic gaze. As an action, the broodlord chooses one creature that it can see within 5 feet of itself. If the target can see or hear the broodlord, it must succeed on a Wisdom saving throw against a DC of 15 or be charmed by the broodlord until the end of its next turn. The charmed creature's speed drops to 0, and the creature is incapacitated and visibly dazed.

Broodlord claws and talons. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 16 (2d12 + 4) slashing damage.

Twin linked. the broodlord may reroll its damage rolls 5 times per day, it must use the new roll