The Divine One took out the protection for the summoning at the end of Divine Divinity, but not in time to stop the summoning. After that the Black Ring was content to leave the child in his care, and sent a witch, Ygerna, to start awakening his powers when he was old enough.
After Damian walked in at the end of Ygerna's execution (having helped with her Black Ring necromancer father's experiments on children) he ran away, found the Black Ring and came back at the head of an army. Damian ordered everyone to leave the Divine One to him, and followed the Divine a short distance away from the main battle to the rift temple.
You don't get the point. I don't care about witches. I understand why they haven't "helped" Damian AFTER Divine One hasn't killed him, but I don't care about this. This ISN'T the thing that makes no sense.
EVERYTHING depended on the summon - WHY hasn't Black Ring sent EVERYONE to protect summoning? Not only Josephina, Iona, etc., but everyone? They had more members, yes?
So, why the whole Black Ring wasn't there? Why weren't they protecting their only chance of victory, change they fought for for years? What's better than meeting their master after so many years? They could lose status, power and potential reward by NOT being there when he's back. Even worse, Divine One could just kill the baby! Possibilities are endless.
Besides, they even KNEW Divine One will come. Why wouldn't they send everyone they had to protect their only chance of victory?
Answer nr.1 - because they are imbeciles.
Answer nr.2 - because Larian though it was shmart for great dark wizards to not protect their only chance of victory
Answer nr.3 - both
Your talk about Ygerna and Damian just... doesn't matter. It has no point. It doesn't connect with my questions.
Evil organizations do all kinds of smart things between games (and movies, etc). It is only during the game that they wait for you to reach a certain point before attacking, send out weak minions to deal with you and then gradually send out increasingly stronger opponents, etc.
How does this talk connect to Dwarves gloating that nothing can reach them in their city, and Elves having multiple cities and them both being "beaten" by the Black Ring?
The problem is that they do smart things between games, and nothing smart in games.