Necro is getting + Maximum Mana from Ring

Seal of Vizjerei is rolling + Max Mana & + Max Essence

Did it drop like that, or did it start with +max mana, and then you rolled +max essence on it?

They should be mutually exclusive, but it might explain how it happened.

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https://imgur.com/a/XDxufyv

Strange indeed.

My guess is that since it is a Unique item, and it belonged to a Mage (as per the flavor text) it will always roll with +max mana regardless of the class it drops for.

It is probably not actually a bug but more of a Story thing.