Rage of the Wild (Ex)
At 4th level, a wild stalker gains the Rage ability as the barbarian class feature, but its barbarian level is considered to be his ranger level –3.
This ability replaces hunter’s bond.
Others have pointed out that the Wild Stalker archetype probably contains some errors with regards to what powers are replaced and when. They also suggest that Rage of the Wild setting the Barbarian level to the Ranger level -3 for Rage doesn't explicitly mean anything, and have interpreted that it is to be used to determine when level-limited Rage Powers are available.
If that's the case (and is it?), do levels from Wild Stalker stack with Barbarian class levels? For example, can a Barbarian6/Wild Stalker5 select Rage Powers which require a Barbarian level of 8?
I don't see why they wouldn't stack...
Normally, a ranger doesn't have any 'barbarian level'. This class feature provides them with a barbarian level of 'ranger level -3' which should be added normally to any other levels of barbarian you have for purposes of things which use/require them.
I agree, I just wasn't sure. It's also probably a pretty bad idea mechanically, just something I was exploring for a character build: a Barbarian Titan Mauler/Wild Stalker Ranger.