Leatherhead
Possibly a Idiot.
Hypersmurf said:Well, the skill allows him to use the scroll as if it were on his (that is, the Rogue's) class spell list. He doesn't use the scroll as if he has the sorcerer class list, or as if he has the wizard class list; he treats the spell as being a Rogue spell.
So he uses whatever ability score Rogues use when casting spells without using UMD
-Hyp.
Actually, no.
When using UMD to cast from a scroll, you emulate another classes ability to cast spells. You use the ability score that would be used to cast the spell for whatever class that you are emulating. (int for wizard spells, wis for clerics, cha for bards, etc...) If your that score is not high enough, you can use a separate UMD check -15 to substitute for that score.