There are either some major error in the Intesify Spell description or in the description of some Epic Staffs.
According to third paragraph on page 61 in ELH under Intensify Spell: "Saving throws...are not affected." Which effectively means that this feat does not affect the spell save DC.
But when flipping over to page 142 in ELH and scanning forward, there are many staffs with intensified spells (such as staff of cosmos and staff of winter) with HUGE spell save DCs.
Take a look at the staff of cosmos. Its intensified chain lightning has a spell save DC of 29(!). According to the Intensify Spell feat, this DC should have been 19, not 29.
Staff DC = 10 + 1.5 * spell level.
Normally the mentioned spell's DC in any kind of staff is DC 19 (= 10 + 1.5 * 6), but the staff on page 142 has DC 29 (= 10 +1.5 * 13).
All this implies that the staffs on page 142 in the ELH with intensified spells have an effective +7 spell level (as they would if the mentioned feat did affect spell save DCs).
So which way is it?
Does the feat raise the effective spell level with +7 levels (as it does according to the mentioned staffs), or doesn't it (as it shouldn't according the feat description).
Clearly, the authors didn't communicate much on this matter.
According to third paragraph on page 61 in ELH under Intensify Spell: "Saving throws...are not affected." Which effectively means that this feat does not affect the spell save DC.
But when flipping over to page 142 in ELH and scanning forward, there are many staffs with intensified spells (such as staff of cosmos and staff of winter) with HUGE spell save DCs.
Take a look at the staff of cosmos. Its intensified chain lightning has a spell save DC of 29(!). According to the Intensify Spell feat, this DC should have been 19, not 29.
Staff DC = 10 + 1.5 * spell level.
Normally the mentioned spell's DC in any kind of staff is DC 19 (= 10 + 1.5 * 6), but the staff on page 142 has DC 29 (= 10 +1.5 * 13).
All this implies that the staffs on page 142 in the ELH with intensified spells have an effective +7 spell level (as they would if the mentioned feat did affect spell save DCs).
So which way is it?
Does the feat raise the effective spell level with +7 levels (as it does according to the mentioned staffs), or doesn't it (as it shouldn't according the feat description).
Clearly, the authors didn't communicate much on this matter.