I believe that is mentioned here on the website.
Will have to check to see if the section on intelligent arcane devices has been posted.
“Sentient Arcane Devices” are of two types, AI’s and then devices with spirit’s attached (using anima jars).
Ruiden has a soul, you can see it if you look. However, his rather bright mana aura tends to obscure it, so you might not have noticed it.
One of the reason’s it’s nice to quench a new blade in Newborn’s blood is to vacuum up the soul into the sword so you have an intelligent sword etc. Not saying that’s how Ruiden was made…wasn’t there at the time, but it is common.
You can also just collect a lot of animus and let it gradually form sentience over time and ingestion of mana. Best way to know which is if the devices goes for thoussand years before suddenly talking or indicating sentience, or if it’s starts bitching at you very shortly after it’s made (if an adult soul is used). Those tend to be very cranky. If they were newborns, you usually notice sentience after a hundred or two years.
There is a being called the Mobius Magi that has been (or will be mentioned, don’t recall which) mentioned. And he/it is a crown at various times–including a crown that wears himself–or a himself that wears the crown…or something. He will show up in Seas of Astlan, assuming that series (the adventures of Captain Asmeth) gets written. T-A-G is so freaking slow!