I used to have a TON of holy crystals saved up, but I must have eaten through them all leveling up random people with all these king cactuars dropping like candy. I only have 3 left and can't awaken anyone. D'oh!!
Is CoA - INT still the best place to farm those? Does it actually help to bring along Xon/Locke? It's been a looooooong damn time since I had to farm a mat.
I honestly prefer Pro as I always seem to get at least 1 each of Sacred and Holy. Whereas INT and ADV often go with none for either :/
I'm pretty certain Locke makes no difference, and even though Xon has that stronger Treasure Hunter, I think it still doesn't apply as Crystals aren't "rare" loot, but an additional loot... but I'm not certain on him.