Cedric already knew the only way he could leave Netheralis was if he had perfect control over his powers. Elysia nor Thamiel explained why but he guessed it was because his strong presence might upset the balance of things in the mortal realm
This would draw the attention of the gods of Elaris besides there was also the curse, the reason he has those strange marks. The strange tattoos are associated with his powers. They were demon curse marks, and the more his power demonic presence grew the more the marks grew.
They were the bonds tying him to Netheralis, yet that wasn't his biggest obstacle. It was something else.
Cedric felt his heart pound fast in his chest.
Fear,
When was the last time he was truly afraid? The thought of there being something which was truly capable of keeping him away from her made him truly scared.