Sentry Beasts are a new group of enemies from Okamiden. There is a large variety of them but they all share one thing in common as they all appear outside of Demon Scrolls. However, they can still be attacked using Weapons and Brush Techniques.
They often emerge from spawning pits, which are easily identified as they are red and black in colour. Often the spawning pit will be destroyed, once a certain amount of Sentry Beasts have been released or a Boss has been defeated.