Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

How would the DC be calculated on a 1/day Dismissal spell on an item (Rod of Celestial Might) that is cast at level 12?

The wiki states "the DC of this spell is calculated like this: (caster DC+caster level)-HD of the affected target"

What would the "caster DC" and "caster level" be for this formula?

If I used a scroll to test this, does it use the same formula as an item?

Anyone have any idea, or used this staff?

Unless stated otherwise on the items description the dc should be 14