Dive. On this creatures turn while it is flying more than 30ft. above the ground, it can choose to expend its movement to Dive. While Diving, for each 5ft of movement expended in any direction, this creature falls 30ft.; and can choose to end the dive at any time while it still has movement. If this creature does not end the Dive before hitting the ground, it suffers fall damage twice. If this creature moves more than 5ft. after cancelling its Dive, it loses all benefits to its Cleave attack. For every 5ft. moved horizontally while the Shadowfell Whisper Dives, deal an additional 2d8 damage with its Cleave attack.   Evasion. If the Shadowfell Whisper is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, the Shadowfell Whisper instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.