Required UMD to cast 6th tier scroll

[Eden]

How many UMD do I exactly need to be able to cast a 6-tier clerical spell from a scroll?
Thank you

[Simian]

You need to beat the DC of 31. So, 30 points in UMD should be enough to cast it without error.

[Valefort]

There are two checks, one to be able to read the scroll and then a second check to successfully cast the spell.

To be able to read a lvl 6 scroll you need 23 UMD (otherwise it appears reddened).

Use a Scroll: Lvl 1(DC13), Lvl 2(DC15), Lvl 3(DC17), Lvl 4(DC19), Lvl 5(DC21), Lvl 6(DC23), Lvl 7(DC25), Lvl 8(DC27), Lvl 9(DC29)

And then to cast a spell you must a make a 25 + spell level DC, 31 for your level 6 spell.

[Eden]

All right, I'll give up with the idea of achieving critical immunity with a fighter.
Thank you!

[Deathgrowl]

critical immunity with a fighter.

http://nwn2db.com/build/?154284

[Karris]

Or just for once don't dump CHA (!), take able learner, a few levels of rogue/bard/warlock? and crossclass the hell outta UMD. Your AB might take a minor hit but each has benefits you can easily use with a fighter build.