Petrosapiens are a crystalline species that can shoot and control crystals. They can make spears out of their arms (see picture) and bring crystals out of the ground. Many people think they're made of Taedenite, but they only look like it. Vilgax wiped all of them out, with the exception of Tetrax, but they were revived.
- Rehk (Half)
- Ultimate Diamondhead
- Ultimate Diamondhead (Noah 10)
- Patrick (from the borg10 series)
- Ultimate Kevin(part petrosapiens)
- Evil Petrosapien (Chris 10: Total Revolution)
In The First Mission a Evil Petrosapien who was a ex student of the school attacks the students and Magister Hulka. Chris and Ethan are able to stop him till backup comes and arrest's him. For defeating him Magister Hulka pass's them both.