I was feeling adventurous and ended up reading Ancient book of knowledge, which I recently got from a chest. Usually, reading the skill books near end of the reinc isn’t a good idea as the bonuses clear on reinc.

However, as I was unable to decide my next reinc, I was hoping guidance from the RNG gods and looks like I got one. Reading the book increased my Damage criticality skill from 100% to 107%.

You feel more knowledgable about damage criticality.
grep Damage show skills
| Create vortex                     41 | Damage criticality               107 |

I had put effort for +damcrit in this reinc and this was sort of the best possible match. Now I need to continue at least some days/weeks in the reinc to see the effect of the skill increase.