Raven Swarm
CREATURE 3A flock of ravens is known as an unkindness. Certainly, the name lives up to its meaning when a swarm of ravens decides to work together. In most cases, a raven swarm like the one presented here won't attack larger foes, but when manipulated by supernatural forces or simple desperation born from hunger, an unkindness of ravens can be a surprisingly dangerous threat.
Few birds are as cunning and social as the raven.
This monster doesn't have a single mind (typically because it's a swarm of smaller creatures), and is immune to mental effects that target only a specific number of creatures. It is still subject to mental effects that affect all creatures in an area.
There are few things as dangerously persistent in the natural world as an angry unkindness of ravens. A raven swarm can hound its prey through most barriers. Simple latches, unsecured chimney flues, loosely shuttered windows, and similar obstacles rarely keep an unkindness away. A raven swarm attempts a Thievery check to bypass many of these simple obstructions, typically against DC 20.
The ravens' angry pecking deals 2d8 piercing damage to each enemy in the swarm's space (DC 20 basic Reflex save). A creature that critically fails its save is Blinded for 1d4 rounds as the ravens focus their attacks on the target's vulnerable face.