There are several areas that kensai previously couldn't travel to, even in a group, but now can thanks to the freedom addition. However, there are still several areas where the kensai is barred from, without exactly the right party make-up. Mostly these are areas where you must have negative energy protection or (less frequently) death ward.
In order to increase the flexibility of the kensai path a little bit without giving it a straight increase in power from what it is now, create a list of abilities that the kensai can potentially have. A few examples could be:
- Freedom
- Negative Energy Protection
- Death ward
- Fear immunity
- +X AB
- +X regen
- +X AC
- Weapon keened
- +X saves
This would allow the kensai to potentially travel to places like Manor of Mourn, Baator, and Benwick, from which they're currently all-but-barred... they just don't get Freedom in addition to the extra bonus.