Bear's Endurance on Raging Barbarian

[frankthedm]

Why not? Makes sense to me, and it may be a nice idea to help the Barbarian.

Then CON poison has to shorten the barbarian's duration. [Along with how long his rage lasts as well]

 

[Thanee]

Additional note, just in case you haven't thought about it.
Have the cleric remove the bab's fatigue after the range ends, and there's nothing stopping him from re-entering a new rage (assuming he has rages left.)

And how exactly would that help?

At the end of the rage, the barbarian loses the rage modifiers and restrictions and becomes fatigued (–2 penalty to Strength, –2 penalty to Dexterity, can’t charge or run) for the duration of the current encounter (unless he is a 17th-level barbarian, at which point this limitation no longer applies; see below).
A barbarian can fly into a rage only once per encounter.

Has nothing to do with the fatigue, really.

Bye
Thanee

 

[Ridley's Cohort]

Then CON poison has to shorten the barbarian's duration. [Along with how long his rage lasts as well]

Yup. Remember that the Raging Barbarian is likely to have the best Fort save in the party, so this is hardly unfair. Either everyone on the front line is getting hit by poisoned attacks, or someone is trying a very desperate tactic. Either way, I do not see a problem.