Call of Cthulhu Monster Conversion: Byakhee

Strength: 5
Dexterity: 4
Stamina 2

Intelligence 2
Wits 2
Resolve 2

Presence 2
Manipulation 1
Composure 3

Athletics: 2

Brawl: 3
Stealth: 1
Survival: 3

Armor: 2/2 (fur and tough hide)

Fast Reflexes 2
Fleet of Foot (Fly only) 2

Willpower: 4

Initiative: 9
Health: 8

Size: 6
Speed: 10 Walk (1 Creature Speed Factor) / 21 Fly (10 Creature Speed Factor)
Mythos Rating 3

Attacks
Claws (1L) 9L
Bite (1L) 9L + Blood Drain
*Blood Drain 6B

These creatures are dangerous to attack due to their high Initiative and quick speeds, not to mention their damage output, and are best hidden from due to their rather average perception checks.  If you can bring them to the ground you can take advantage of their ungainly gait which sees them at a comparative disadvantage (if you can call average speed a disadvantage).  Their armor is equally effective against fists, swords and bullets.  Its mythos rating works like Blood Potency or Gnosis to resist supernatural effects.