Ethan said:

It's pretty random I am afraid. 

Thank you,

And any one knows when upgrading a skill does it start automatically to upgrade the leftest one and I can not choose which skill to upgrade first?

Angwil said:

You can not choose which skill it upgrades, but it does not automatically upgrade the one to the left.  It uses RNG to decide which skill gets upgraded.

Thank you very much for a great answer!

Do you have an active clan that look for players?

Looks like it is random. I am not 100% sure but looks like so. I have tryed to use 3 books at time to make all 3 skills my hero have upgraded, but instead one of skills was upgraded to 3 level.

shayha93 said:

Angwil said:

You can not choose which skill it upgrades, but it does not automatically upgrade the one to the left.  It uses RNG to decide which skill gets upgraded.

Thank you very much for a great answer!

Do you have an active clan that look for players?

My clan is somewhat active, a mix of mostly low players attacking Easy/Normal CB and a handful attacking Brutal/NM.  If you are interested, I'll figure out how to invite you.  Post here or email me @ [email protected]

And yes, the skill upgrade is random. SAVE your epic books. Do not use on Shaman.

LW05 said:

Trips said:

And yes, the skill upgrade is random. SAVE your epic books. Do not use on Shaman.

I am new in game. What the diferrence between normal and epic books? Thank you.

Normal is almost worthless and can only upgrade rare champions --- cost maybe $0.1

Epic is for upgrading epic champions (wasted if used on rare) --- cost roughly $2

Angwil said:

You can not choose which skill it upgrades, but it does not automatically upgrade the one to the left.  It uses RNG to decide which skill gets upgraded.

Thank you very much for a great answer!

Do you have an active clan that look for players?