The Right Eye of the Ruby Dragon mod, no matter the rank, cannot be slotted into Cosmic Vision of Rage. I don't know about the Cosmic Vision of Wrath, but I doubt that it'll go into that either.
Pardon me, I may have said it wrong. But that's what i'm trying to say. It does not go into the cosmic secondary utility. It won't go in there, no matter the rank.
I think a couple of the damage utility mods have that bug. It's not very important, as putting one in a cosmic secondary is almost always a poor choice (you're almost always going to be better off by slotting it in your primary utility and using a distinguished or onslaught secondary utility).
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Epic Stronghold
Block timing explained