OK, even though I currently have another build going I have been eying the Knife Master archetype with great interest but I never make straight builds any more. Of course my main interest is in this ability:
Sneak Stab (Ex): A knife master focuses her ability to deal sneak attack damage with daggers and similar weapons to such a degree that she can deal more sneak attack damage with those weapons at the expense of sneak attacks with other weapons. When she makes a sneak attack with a dagger, kerambit (page 130), kukri, punching daggers, starknife, or swordbreaker dagger (Advanced Player’s Guide 178), she uses d8s to roll sneak attack damage instead of d6s. For sneak attacks with all other weapons, she uses d4s instead of d6s. This ability is identical in all other ways to sneak attack, and supplements that ability.
Now I know that there are a couple of prestige classes and archetypes that have the sneak attack ability such as assassin, shadowdancer, and vivisectionist. How does their sneak attack damage stack with a rogue who has the Knifemaster archtype when using knife like weapons? Does the d8 (knife) and d4 (all other weapons) damage apply to all sneak attack damage from all sneak attack sources or would I have to be rolling a combination of dice based on those sources?
Also I am wondering if anyone can tell me of other sneak attack classes, archetypes or prestige classes other than ninja.
IMO, the key phrase is:
This ability is identical in all other ways to sneak attack, and supplements that ability.
All sneak attacks you have follow the special version.
Vivisectionist gets sneak attack, for trading out bombs.
Shadowdancer and Assassin get sneak attack too, IIRC.
Master Spy also gets sneak attack at a slightly slower progression.
Thanks all. That is good enough for me. Although I would like to point out that a rogue knife master could not take levels of ninja because ninja is an alternate rogue class so you can only take either rogue or ninja.