How much UMD is enough UMD

[San]

I was wondering actually what is the satanic mechanic for the game to say yay or nay for using scrolls and items etc (for non scrolly types). For future reference .

[Freaxxshow]

15 UMD total is enough to use any and all Scrolls and wands

It counts the bonus/penalty from your Charisma Mod for that magical 15

To use Items and ignore restrictions, the calculation is based on the items Gold Worth which is... Funky

[Alcomancer]

Freax has it right here. Don't go past 15 unless you're trying to use class or alignment restricted items - in which case just max it out because it's very difficult to determine that information.

[The1Kobra]

I've found 15 enough for scroll/wand use. You probably want 20-25 if you want to use alignment, class, or race restricted gear though. Alignment restrictions have a higher DC than race restricted gear, which has a higher DC than class restricted gear.

There's less alignment locked gear these days than there used to be, and more alternatives that aren't alignment or race restricted, but there are still a few pieces here and there. (Like a very strong bastard sword that's good only, and a very good caster armor that's evil only)