Saga balancing

As you all noticed, I changed quite a bit. Now I need your input on Sagas balancing.

Are the ability cooldowns too low/high? Consider that abilities can be upgraded up to level III, which will decrease cooldowns. And you can get any main ability fairy early (5 attr points). There needs to be a reason to upgrade.

Is the exp gain too fast/slow?

I will probably decrease exp/enc points gained from spawners by a lot, because it is exploited. Is it ok?

If you have other concerns, then I want to know.

ok i say higher the fireball rate i'm able to almost spam them in the arena also i think it is way to easy to gain xp as you probably know but i say keep the spawner level the same and but our zombie spawner back to the way it was