Cedric understood that his new grandfather was eccentric but never knew the extent of his shenanigans. When asked directly, Eldrin was annoyed and dodged the question. At the very least, Cedric knew that Eldrin was aware of his own errors.
As soon as sunset arrived, Cedric unleashed the beast: his shadow. It roamed the forests next to the capital and killed any monster it found. Cedric ensured he only hunted at night to avoid alerting the church.
After a quick meal with Morrin, who also trained in the hut, Cedric would then practice his newfound knowledge. After understanding the basic structure of summoning circles, he began adjusting the ones his skills created.
Of course, that led to many failures.