Pacific Rim Kaiju Category 4
The Kaiju ( 怪獣 , kaijū ? , Strange Beast) are a race of amphibious creatures   genetically engineered by the Precursors , a sentient race from the Anteverse . In 2013, the Precursors opened a portal between dimensions at the bottom of the Pacific Ocean, allowing the Kaiju to enter Earth's dimension. As biological weapons of warfare, Kaiju are extremely hostile and toxic creatures designed with the intention to wipe out all humankind .