Luckily while his mind wandered, it was mostly occupied with what he had read. For the sake of it, Eldrian had gone through the compendium on fire magic again, at least the bit before and on Volida. After having cast it, what was written about it made more sense.
Not much, but he was starting to understand how it mentioned the mixing of elements. It didn't go much into detail, mostly having stated that most spells require more than just the focus element to properly work. Which Eldrian was only starting to realize.
This was the cause of all the difficulty when learning higher Tiered spells, and more importantly, the cause behind the difficulty in trying to make new spells.