Heinald had informative conversations about runes with Lord Fredor every day during his week in the castle, and to learn the effects of the runes he find out from the Rune Tablet, he modeled them all in his mind and then integrated them with his magic energy. These runes were all related to Elemental Energies, unfortunately there were no Space or Light related runes among them.
Still, he was incredibly excited by the important information he had learned. Moreover, some of these runes were quite high-level runes. He thought that if he worked on these runes, he could make some of the spells he knew stronger with some modifications.
Moreover, Lord Fredor had also shown him some of the runes and seals he knew. All of these runes and seals were higher than the sum of the runes and seals in the thousands of books he had read before. After all, Fredor's specialty was runes and seals, which was not surprising.