Attunement | Dark Souls Wiki
The maximum possible number of Attunement Slots is 12 slots (having at least 50 points in Attunement and equipping both rings).
Stats | Dark Souls 2 Wiki
Once you hit 30 Attunement, you will only get one more Attunement Slot per 10 levels.
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Magic damage: +20-26% depending on spell; Stacks with Crown of ... Attunement slots: +1 slot; Grants player entrance to Darkmoon Blades ...