I was determined to beat the Golden Demon King without any help or rentals and finally managed to do it; they put up a hell of a fight. Lucretia effectively nullified the speed penalties from the crystals and she and Ateru teamed up to blow through their health bar. Hariela's new skill came in use as well, because she enabled Fermi to drop-kick him several times so she could stun him out of summoning the clones. Eventually they were able to pull out two of them and knocked out Ateru, but by the time they did, Lucretia and Ateru had weakened them enough that Lucretia was able to finish them off with her skill and the other girls cleaned up the mobs.
It's cool seeing some more Monstrous Monsters too. There were even Yatagarasu flying around. Still no Yatagarasu Girl, though......