This hulking, wide-headed ant is the size of a horse, its antennae twitching and mandibles scarred.
Knight Ant CR 4
Knight ants gain Coordinated Defense as a bonus feat, and giant ants from the same colony also gain this feat when adjacent to a knight ant. As a standard action, a knight ant can use its oversized head to provide total cover to creatures behind it or sharing its space, as if wielding a tower shield.
These giant ants use pheromones to organize the complex work and protection of their colonies, identifying insects of their own or allied colonies and warding off intruders. They have a specialized physiology, including both enhanced pheromone glands and an especially wide, oversized head. The sheer size of its head allows a knight ant to block off entire tunnels within the hive in order to protect its fellow ants. It remains in place long enough to fend off invaders, even at the cost of its own life.
A knight ant is 10 feet long and weighs approximately 1,100 pounds. Its head is 7 feet across, and the flanges on the sides make it appear slightly concave.
Pathfinder Roleplaying Game Bestiary 5 © 2015, Paizo Inc.; Authors: Dennis Baker, Jesse Benner, John Bennett, Logan Bonner, Creighton Broadhurst, Robert Brookes, Benjamin Bruck, Jason Bulmahn, Adam Daigle, Thurston Hillman, Eric Hindley, Joe Homes, James Jacobs, Amanda Hamon Kunz, Ben McFarland, Jason Nelson, Thom Phillips, Stephen Radney-MacFarland, Alistair Rigg, Alex Riggs, David N. Ross, Wes Schneider, David Schwartz, Mark Seifter, Mike Shel, James L. Sutter, and Linda Zayas-Palmer.