12-17-2014, 12:39 AM
There was an MP Thief feat that allowed you to steal MP with Sneak Attacks instead of dealing damage iirc, but if you were to convert the Spell Thief you'd have to change all mentions of spell levels to MP I guess...? All in all the changes wouldn't be that big, but as already stated it would fall short to almost any other Prestige Class and possibly even most Base Classes in raw 'power', though classes that do exactly the same thing might be short in supply.
The closest off the top of my head was Mime which could take 'Mimic Spell' or 'Mimic Song' and then be able to perform/cast one they see someone else watch, though they can only ever mimic up to a 5th level spell/song(assuming all 10 levels were taken), up to 7th if a particular Focus was active to boost spell/song usage.
So yeah... stealing spells to use yourself? Little harder to do, but if you just wanna steal a caster's MP there's a feat for that which would work well on a multiclass Thief/Caster, or for that Street Magician I guess... if they have an MP pool.
The closest off the top of my head was Mime which could take 'Mimic Spell' or 'Mimic Song' and then be able to perform/cast one they see someone else watch, though they can only ever mimic up to a 5th level spell/song(assuming all 10 levels were taken), up to 7th if a particular Focus was active to boost spell/song usage.
So yeah... stealing spells to use yourself? Little harder to do, but if you just wanna steal a caster's MP there's a feat for that which would work well on a multiclass Thief/Caster, or for that Street Magician I guess... if they have an MP pool.