One of the most popular superpowers present in the comics Eric read during his adolescence was mind-reading.
At the time, he only thought it would have made manipulating people way easier.
Certainly, nothing to write home about.
After all, it wasn't something totally out of the conception of reality for him.
For Eric, mind-reading was something like a tv-remote for the average person.
He was able to obtain the same thing using his own abilities, but having a faster and easier method to achieve the same result was always preferred, and often it could be the main reason behind the success of a product.
His entire mentality and past life in Ouroboros made Rubra's new ability easier to accept.
The entire process started when they had just finished the fight against the two dragons sent by Tiamat in Zolgas.