lvl -1 10% crit chance.

lvl -2 12.5% crit chance.

--- 3~~

--- 4~~

lvl -5 20% crit chance.

are these bonuses flat bonuses ? or 20% increased at level 5 based on the crit chance you already have?

Essentially my question is...

Does this make a non crit build perform crits at a 20% chance, or does this skill only improve a crit build by an additionally 20%?