Kyrone wrote:
No, any Wizard can use a staff.
I will give an example to make the explication easier.
Let's say that we have a staff of water
It would have
Cantrip: Spout
1st Rank: Create Water, Hydraulic Push
But the Staff Nexus one would have an extra cantrip and 1st rank spell of your choosing like:
Cantrip: Spout, Shield
1st Rank: Create Water, Hydraulic Push, Sure Strike
After level 8 you can put more charges on it than other casters, the average Wizard would have the 4 charges of the staff + expend a spell slot to get more charges, while the Staff Nexus one can expend 2 slots for that.
So the Maximum in theory would be at level 8.
Average wizard: 8 Charges, 4 from the staff + 4 from a lvl 4 slot.
Staff Nexus: 12 Charges, 4 from the staff + 8 from two lvl 4 slots.
Don't you mean "rank 4 slot[s]?"