Bacars resembled oversized ants about 10 feet long, with dark red bodies that ran to black along the thorax and steel-blue underbellies. They could also carry weapons or shields with them. The bacar queen, however, was a larger, bloated creature.
The only bacar colony lived in the valley of Ixtzul. They lived in a society like an ant colony's, ruled by a queen. Individual bacars (except for the queen) were not very intelligent, but gained intelligence when in groups (the larger the group, the more intelligent). They spent most of their time patrolling the valley and maintaining the wards in the city, as well as the city itself.
The queen, like an ant queen, was responsible for laying all the eggs in the colony. She was also highly intelligent and gave orders to the bacar. Bacar had a limited form of telepathy, and relied information and orders by touching antennae. Killing the queen, however, caused them to lose both their intelligence and telepathic abilities.
Since not all of the eggs the queen laid were necessary, the bacar only allowed new eggs to hatch in order to replenish lost numbers. The surplus eggs were eaten. If the queen died, then the next egg hatched would be a new queen, but it would be two years before she could lay more eggs. There was only one bacar queen at any given time.
All bacar could attack by biting, but in groups gained the intelligence to use weapons (such as macas) and shields. Lone bacar did not possess any initiative and would ignore intruders unless ordered otherwise or attacked.
In larger groups, bacar gained the ability to command army ant colonies in the area.
The bacar were created using pluma and hishna magic from ants by the last Revered Counselor of Ixtzul, Greyst Seven Cloud to guard the enchanted Star Worm. After the last humans left the valley of Ixtzul, the bacar remained and lived there for at least another 600 years.