While not technically called the Golem, this NPC’s name is written in an unknown language. It can be found in the secret underground cave across the bridge from The Collector.
The Golem is part of a quest chain to unlock the boxing gloves. The Golem can also be interacted with to change your team.
The Golem was introduced to the game on July 14th, 2021 as part of the Boxing Gloves ingredient quest update.