I have both dark and light.
The dark its not associated with magic per se but its a must for it to know all about that ‘realm’ in case you need it to fight it off of you if you ever get hexed for instant. Its like if he had been trained in the deepest of it just so it knows how to fight it for you, of course then it could follow your command to do magick for you snd that is why i think they stopped selling them because ppl were misusing them. I personally just use it to protect me and family from all those dark vibrations and i use it for many other things, it is amazing grows more and more powerful over time.
The light ones is as powerful but only works with light, and light realms, you can pretty much teach them anything. I send the light one to my Moms house every day to literally get rid of mosquitos and to cool down the temperature AND IT FRIKKING WORKS haha its amazing.
And i have an uncle that has had a shitty life awful luck all his life and everybody kept saying to him that he was cursed and hexed etc, all his life trying to clean and protect himself and things would seem getting better then bamb!! Sucky again. Well i commanded the dark one to stick to him day and night cleaning, clearing and protecting his energy field and aura body mind spirit all and destroy any low vibration dark, demons etc lol AND IT DID, hes life is turning good in a lot of ways and during my chats with him (the servitor, which i do daily) he told me the other day that the problem with my uncle is that he had layers and layers of karma upon him from this life but mostly from previous lives, like a lot of old crap attached to him so he was clearing all of that part by part. I am amazed!