How to get C3 gear?

Asking here because the wiki is outdated, I've got full C2 gear and even a C3 ring, all gems stellar and unlocked, two empowered crystals including cosmic, most on magic damage and crit stuff. However, I can't for the life of me find crystal 3 gear. I don't know the old Uber system, but I'm farming 13 topside as I can't get into 14 to join all the "ships". Is it just an incredibly rare drop? It seems rare enough to find C2 gear there. I can't get anymore light, I've got the paragon pet, crystal gear, gems nearly maxed out, banner etc. Please could someone help? I feel stuck in my progression. I'm about 2k light from joining 14