Effective Barbarian Levels and Rage Powers

[Rabscuttle]

Do effective levels of Barbarian Rage from multiple classes (eg Viking, Wild Stalker) stack when determining if a character can take a Rage Power, and how powerful that power is?

For example, say I have a

3rd Barbarian
6th Viking
5th Wild Stalker

Viking and WS rage as level - 3, so I have 3 + (6-3) + (5-3) = 8 levels of "effective Barbarian level"

Consider Renewed Vigor, which has both a level prereq and improves as you gain levels.

Spoiler:

Quote:

Renewed Vigor (Ex)

Prerequisite: Barbarian 4

Benefit: As a standard action, the barbarian heals 1d8 points of damage + her Constitution modifier. For every four levels the barbarian has attained above 4th, this amount of damage healed increases by 1d8, to a maximum of 5d8 at 20th level.

So the two questions are:
1. Could this character take this Rage Power?

2. How much would it heal? (If the answer to 1 is no, assume with an extra Barb level (4th Barb/6th Vik/5th WS)

==

And a related question:

The Mad Dog Barbarian archetype rages as a standard barbarian - 3. Could a 4th level Mad Dog take Renewed Vigor as their 4th level rage power, and how much damage would it heal when they reached 8th level?

[arcanine]

Rabscuttle wrote:

Do effective levels of Barbarian Rage from multiple classes (eg Viking, Wild Stalker) stack when determining if a character can take a Rage Power, and how powerful that power is?

For example, say I have a

3rd Barbarian
6th Viking
5th Wild Stalker

Viking and WS rage as level - 3, so I have 3 + (6-3) + (5-3) = 8 levels of "effective Barbarian level"

Consider Renewed Vigor, which has both a level prereq and improves as you gain levels.
** spoiler omitted **

So the two questions are:
1. Could this character take this Rage Power?

2. How much would it heal? (If the answer to 1 is no, assume with an extra Barb level (4th Barb/6th Vik/5th WS)

==

And a related question:

The Mad Dog Barbarian archetype rages as a standard barbarian - 3. Could a 4th level Mad Dog take Renewed Vigor as their 4th level rage power, and how much damage would it heal when they reached 8th level?

I want to say yes. the levels would stack but only once you get the rage ability from each class. I think you math is on point. Weird build tho.

And the mad dog barbarian wouldn't have a issue with it because his effective BARBARIAN level is still 4. Not his rage level.