Storm Ants

The first of the Giant Creatures released by the Aggressors,
Storm Ants are roughly 10-11 meters in length, with an estimated weight of 25-30 tons.
Their upper jaw is powerful enough to crush cement, and they spit acid potent enough to instantly melt metal.
Striking in large groups, they have been responsible for the destruction of numerous cities.
Protected by a thick exoskeleton comparable to the armoring of a tank,
these creatures can only be effectively damaged by firearms designed for piercing through hard materials.
The strength of the Earth's gravity would prevent an insect from reaching these proportions, but after analyzing a recovered Storm Ant carcass, EDF's Science and Technology Bureau found that their massive bodies are maintained by a unique, internally stored resource called an "Energy Gem".

Because 90% of Storm Ant DNA is from terrestrial insect life, it is believed that the Aggressors alter the DNA of life from the planets they invade to create living weapons.
Storm Ants have thrived since their release on Earth, converting abandoned buildings and debris into colossal nests, where they further mate and reproduce.
Their numbers are estimated to have far exceeded the total number of human survivors.
As of 2040, the destruction of their nests is the EDF's primary mission, but it is proving difficult for the human population to keep up with their growing numbers.