Aaaanyway... I figured I'd share, I feel very lucky today!
Attachment 9669
Small attachment but oh well... suppose you can always click it. Anyway; I'm well aware that the 'disaster' or 'prison' Eidolons aren't the best around but on the other hand; just because you have a decent chance of obtaining more it's well doable to level break them (easier than your average SSR I'd say) which allows for better upgrades. And of course I also enjoy them because you fight 'm in raid battles. I know; that shouldn't be a decisive factor but I don't care about that because I'm having fun.
So, today, I was grinding SP missions to get upgrade materials as well as raid quests. 3 in a row! It started with the Prison of fire disaster, which at first I hadn't even noticed. I only did when I was upgrading an eidolon to finish a daily mission and well... an SR eidolon I didn't know?
And much to my surprise (and excitement!) light and dark have now also dropped on me. As you can see I already had wind and lightning. Next stop: trying to fight ice disaster raids in hopes of water to drop too, then I'll have the whole collection.