Grievance
Grievances are small invulnerable enemies that appear similar to 
Grudges. Grievances will be in a dormant state at the beginning of a room, emitting a red circle around them which is their detection radius. If Isaac enters within a Grievance's detection radius, it will open its eye and extend its spikes before launching itself quickly towards him with low friction, sliding around the room and bouncing off any walls and obstacles it hits. Once the Grievance loses speed and stops, it will return to its dormant state until alerted again.
If a Grievance hits another stationary Grievance while sliding, it will be launched as well. However, if a Grievance collides into any other enemies while sliding, the enemy will take 5 damage.
Like Grudges, Grievances can also activate buttons if they move on top of them.
All Grievances in the room will be permanently deactivated after the room is cleared or once all the 
Pressure Plates in the room are pressed.
Notes
- The radius of a Grievance's detection circle varies, being determined by the Grievance's subtype ID; the radius grows larger the greater the number used as the subtype.
Gallery
A Grievance's appearance while in its dormant state or after being permanently deactivated.
Grievance's appearance in Gehenna.
