In Divine Divinity, 'source' had been used for healing, but the healers' access to it was cut off for some unknown reason (same for the healing fountain with the single healing gem left). There wasn't a lot of detail about it, simply because at the time there was no way to know how the lore would develop for future games.
The Divinity timeline was actually given in a
D:OS Kickstarter update. There were 2 attempts by the Lord of Chaos to return to Rivellon (both described in the prequel novella included with the game), the first a hundred years after D:OS and the second (where the council sacrificed themselves) six hundred years after. Divine Divinity is set twelve hundred years after D:OS.
Thank you for explanation. I've made wrong decision about time scale due to Zandalor's words in DD. Perhaps, Wizards like women try not to reveal their true age =)
By the way, It looks strange that Aleroth's healers uses forbidden magic =)
I've bought D:OS via Steam during early access and later Source Hunter DLC. There is no any prequel novella.
I've bought Divinity Antology via Steam (DD, BD, Divinity 2 DC). And Divinity 2 Developer's cut seems to contain two novellas: The Prophecy and Child of Chaos. Is any of them contain this history?