Stone Dog said:
No it isn't. Divine strike lets you use your sneak attack dice against undead. Razing Strike lets you add a number of dice to your sneak attack equal to the level of the spell slot burned. Nothing lets you use your sneak attack dice more than once per given attack unless it specifically says that it does. Telling Blow is not specific.
Or do you think that it allows SA dice to be applied to attacks over 30' away since Telling Blow doesn't specifically forbid it? Or to nonlethal attempts with an axe?
Allowing SA to be triggered more than once in a given attack is letting a character have the damage potential of a character twice its level. A 7th level barbarian shouldn't be able to PA for 30 points of damage and a 7th level rogue shouldn't be able to SA for 8d6, even if the events are really really rare.
Razing Strike says "the bonus on damage rolls is 1d6 per level of the spell sacrificed, plus any extra damage based on your sneak attack ability"
And a lance-weilding Leap Attacking Barbarian at level 7 will be doing + Power Attack damage x4, without critting. Add in a crit, or a crit with a greataxe, then compare it to the damage a rogue will be doing. Crits are supposed to hurt, but a rogue's double SA crit pales in comparison to the barbarian's PA crit.
Let's give both characters an 18 STR, unlikely for a rogue, but still.
Barbarian: damage on a greataxe crit = power attack for 6 (2 from charge, 2 from rage, 2 to match rogue's BAB), 1.5 x str x 3, 3d12 average 19.5. 36 + 18 + 19.5 = 73.5 and that's even without Leap Attack. (with Leap Attack, we're looking at around 80 damage)
Rogue: effectively doubled SA damage with Rapier crit (best weapon on rogue list) = str x 2, 10d6 (2d6 rapier crit + 8d6 effective SA) average 30.5. 8 + 30.5 = 38.5
73.5 > 38.5 by far
Barbarian single-handing a longsword instead, Leap attack 18 + 6 + 2d8 average 9 = 33
This is less than optimal, so we'll look at rogue without flanking.
Rogue: 8 + 6d6 average 21 = 29
33 > 29 and the rogue's total attack bonus is several points less.
Oh, and Telling Blow only says add you sneak attack damage to your crit, nothing about 'you can't do this and sneak attack your target too'. This feat came out after the sneak attack ability did, and most other feats that came out later have the limits and qualifiers written into them. Or at least say "this feat lets you sneak attack anything you crit." Which is exactly what you're saying this feat does. So saying 'they meant this even though it says this' doesn't change anything until the errata comes out and says so. This feat looks like it's making the rogue act like a burst weapon between flanking and not flanking. I'm not saying that's right, but there's another precedent to look at, game mechanics-wise .