Trinity is a religious, secret organisation, focusing mainly on the recovery of powerful artefacts using any means necessary. They have been keeping a close eye on Lara Croft for a very long time, and now, they are one step behind her. According to the art book, their armament is spread between their two armed branches: militia and PMC (private military company).
Cult of Kukulkan
An ancient cult that aims to protect the city of Paititi from outsiders.