The Ol'ethros are large battle insects used by the Mantodea as war beasts. Unlike the Mantodea, they do not have any markings. However, they are unofficially considered members of the low rank.
In ancient times, the Ol'ethros were massive insects of incredible brute strength used during wartime. They were used during the Human-Mantodea War, which was ultimately lost. As a result, many Ol'ethros died and only very few hatchings and eggs remain in the present day.
- In ancient Greek, "Olethros" roughly translates to "destruction".