Exlor
Guessing I'm one of the few here who's had a actual job where they made home grown hydrothermal synthetic crystals for real eh! Cooked overnight for about 12 hours could make a few dozen batches. Only ours were only the size of a flattened grain of rice. They were used as timing oscillators in custom made scales.. This was 30 plus years ago.
The golem said growing crystal why I am thinking his crystal maker is not as advance as a race using crystal in weapons and everything else. But building one mech for testing is a great idea and buying some books on crystal making I am sure the system has it. He missing knowledge right now. Humans may only be at beginners to the system knowledge