Improved Sneak Attack

Effect: 

Your Sneak Attack damage is better than other rogues. Use the following Sneak Attack bonus damage progression instead.

Rogue Level Extra Damage
1 +1d6
2 +1d8
4 +2d8
6 +3d8
8 +5d8
10 +7d8
Adventurer Feat: 

Once per day as a free action, you can add your Sneak Attack damage to any hit against one target that would not otherwise have qualified for the damage.

Champion Feat: 

Once per day, roll d20s for your Sneak Attack damage instead of d8s.

Epic Feat: 

One battle per day, ignore the limitation that you can use Sneak Attack damage only once per round.