Cruor drops in small amounts from every mob in abyssea.
You can solo farm on any job in abyssea. The trick to cruor farming is to never kill the same mob type 2x in a row. Also, if you can kill mix the ephemeral mobs, tier 1 voidwalker nm's and Mini-avatar mobs into the mix, its a nice bonus.
As you build a cruor chain this way, you wil get more and more cruor for each kill.
Most players get thier first boost of cruor from leveling up in abyssea. It is an easy way to get an introduction to alot of the basics.
You can farm alot of what you need solo in abyssea, however the things you shoud focus on first are atma and abyssite. This will open the path up for you to work on whatever elements you like.
Choh Moui | Rongo-Nango | Lhu Mhakaracca | Lungo-Nango | Nyumomo