A Keeper of the Feather: crossbow and shortsword as a human, wings and a cursing beak as a hybrid.
AC
HP
Speed
CR
XP
12
54 (12d8)
30 ft, fly 50 ft
2
450
STR
DEX
CON
INT
WIS
CHA
10 (+0)
15 (+2)
11 (+0)
13 (+1)
15 (+2)
14 (+2)
Skills: Insight +4, Perception +6
Languages: Common plus one other language
Traits
Mimicry. Mimics voices and animal sounds; a DC 12 Wisdom (Insight) check spots the imitation.
Actions
Multiattack. Two attacks, Scratch or Shortbow in any mix; one can be a Beak.
Beak (Raven or Hybrid Form Only). A stabbing beak; a Humanoid it hits makes a DC 10 Con save or is cursed: at 0 Hit Points it becomes a wereraven.
Scratch. Raking nails or talons.
Shortbow (Humanoid or Hybrid Form Only). An arrow from a shortbow.
Bonus actions
Shape-Shift. The wereraven turns into a raven-humanoid hybrid or a Tiny raven, or back into its human form. Apart from its size, its statistics are the same in every form, except that it flies 50 feet as a raven (walking only 10 feet) or as a hybrid (walking 30 feet) and can't fly in human form. What it wears or carries doesn't change with it. It returns to human form when it dies.