Hi folks! We've had a lot of questions about the new Tuning system and the way that the blue bonus bar affects Rarity. I wanted to take some time to walk you all through how this new system works:
First, when you Tune a Rune, Rarity and Stars have INDEPENDENT chances of improving on a Tune. What this means is that your level of Rarity won't affect your chances of rolling a higher star Rune or vice versa.
As with the previous system, you can never Tune "down". That is, your next Tune will not be able to decrease Rarity or Stars.
The visual blue bar is an indicator of RARITY bonus only.
When you are about to Tune a Rune for the first time, your chances of Tuning a higher Rarity is the exact same as before the update. The visual bar is not filled at all and you have a 0% Rarity bonus. While there is no Rarity bonus applied, there's still a chance for a Rarity upgrade.
As you continue to Tune a Rune, the blue Rarity bonus bar begins to fill up. This is a visual representation of the odds of you rolling a higher Rarity Rune. For example, if the blue bar is 50% full, you have a 50% chance of getting a higher Rarity on your next Tune. Similarly, if the bar is 75% full, you have a 75% chance of getting a higher Rarity on your next Tune.