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So i have a question again. Google and search function gave me different answers, and i didnt found anything in the FAQ or Books to it.

When i Use a Staff with Use Magic Device, i first have to make a UMD check against a DC 20, like for a wand. But can I use UMD to emulate a higher INT or Casterlvl in conjunction with a Staff. 

For example, i first roll for Using the Staff DC 20. Then i make a role to emulate a Class Feature (lvl in class then = roll - 20 according to SRD) and for that i role a 35, so my effective lvl would be 15. Then I emulate an ability Score, have a Lucky role and get a 40. My Emulated Ability score would now be roll - 15 = 25.

So would i cast a Spell from a Staff then with a casterlevel of 15 and an Int score of 25?

Greetings

Seeron

Sorry, as standard, read the books Oma.

If you read the rule books properly, you will see that Staffs, like wands are spell triggered items, with the difference being that staffs contain higher level spells and a wider variety of spells, as well as being able to use the wielder's CL and relevant feats to determine the spell's DC etc.


The entry in the PHB states under the Use Magic Device skill

Use a Wand

Normally, to use a wand, you must have the wand’s spell on your class spell list. This use of the skill allows you to use a wand as if you had a particular spell on your class spell list. This use of the skill also applies to other spell trigger magic items, such as staffs



Meaning specifically You can use to to activate staffs. A specific DC isn't give, but like wands it would be a minimum DC of 20.

I would be inclined to make Staffs DC 20 + Caster Level, but there is no real specific given, so technically it is just a DC 20 like a wand as far as the rules are concerned. Casters only use their own CL etc if it is higher then the staff's minimum. You could attempt to use the scroll at a higher Caster Level and emulate a higher INT and any number of feats to inhance the spell, You would just make the appropriate rolls, so, yes it would work pretty much the way you described. 

Keep in mind that as staves use the Ability modifier and relevant feats of the user, that the standard DC 20 roll for using it will be rather on the weaker side, so to use effectively you will basically have to do the emulation rolls or else have very low DC spells (not always a big deal)

Seeron, Yes you can choose to use either Int or Charisma in that case, the stat used by the creator isn't important.


The Caster level would probably be the minimum used for the staff, for the DC 20 to use (just like a wand) However you could attempt to emulate a higher caster level if you wished.

 Oma, please read the rules for Use Magic Device, Rogues can use it to cast spells from wands, scrolls and staves despite not having access to the spells, that is the whole purpose of Use Magic Device. They don't need to have spells as a class feature to use spell triggered items.

Rogues and Bards with high Int or Wisdom scores are common place, even so if they need a particular ability score then they can emulate it, as per the rules outlined in the Use Magical Device entry.