| Level | Special |
| 11th | Sneak attack +6d6 |
| 12th | +6 save against poison |
| 13th | Sneak attack +7d6 |
| 14th | +7 save against poison, bonus feat |
| 15th | Sneak attack +8d6 |
| 16th | +8 save against poison |
| 17th | Sneak attack +9d6 |
| 18th | +9 save against poison, bonus feat |
| 19th | Sneak attack +10d6 |
| 20th | +10 save against poison |