How many experience boosts can you have affecting you at the same time? Some of the ones I can think of (aka, ones I can get):

-Human exp boost
-Autumn
-Harmony karma blessing
-and now the exp boost in Aetherbubbles

I'm sure there are more...but there must be a cap on the effects of these, right? What is it?

You forgot Moondance Harvest, for Moon followers.

Phooey, yeah. Just out of curiosity, does it give a percentage boost in the AB, or does is it just vague?

And again, how do these factor in? And how much difference do they make?

Human and harmony are both 20% increases.

Thought harmony was 10%, actually.

Another question then!

Let's say you have harmony and are human. Is it 20% first, then 10% on that amount, or 20% and 10% on the base amounts, added to it?

My guess is that harmony gives you a level 1 (10%) racial bonus, so the human level 2 (20%) bonus becomes a level 3 (30%) bonus, giving you 130% of the experience when you kill something.

It is. And I thought human was 10% too.

Nope. Human is 20%.

So with human, harmony, coven harvest, autumn on, how much xp boost would you have? One kill gives 150% than the normal?

BTW, nice sig Fallen

Heh, add in the harmony construct of 25% on aetherbubbles.

Edit: *cough* I was totally in the wrong thread. Ignore me. I used to be a comment about breasts from Yu-Gi-Oh abridged.

Breasts are never off topic

Racial experience bonuses are ~7.5% per level. A human receives a 15% experience bonus (roughly). Autumn, Harvest, and Harmony are flat 10% bonuses.