Only son of the wealthy Lir Nereus family, born of an alchemist mother and a Wizard father in Nisalvini, Caleb has proved his magical prowess at a very young age. Excelling at school, he had a great affinity with magic and pursued this route, much to the happiness of his parents. He found joy in learning new things and that was all he needed to be a happy child.

His family and he were immensely devoted to Mareus - as was the whole Lir Nereus lineage. They prayed to the goddess daily, and Caleb soon associated Mareus with safety and happiness. Following the family tradition, the Mareus halo was tattooed around Caleb's right eye at age 10 by his mother. This peaceful life continued up until the age of 18, but it was not to last. Caleb's mother traveled to Estraude by sea, only to never return. Her cause of death came weeks later: she had drowned at sea, confirmed by reports of the missing ship.

Caleb's father did not cope well with the death, and would lock himself up in his room to do intensive research on necromancy. As for Caleb, caught between his father's apparent grief and his own shaken faith towards Mareus, was stricken with depressive episodes. Plagued with uncertainty, he wondered why the goddess he'd loved would tear apart his family this way. Initially planning to be a Wizard just like his father, he later decided to pursue Conjuring instead. He knew his father's search to revive the dead was fruitless, and so devoted himself to the discipline that ressembled it the most - summoning lifeforms from other planes of existence. If familiars were spawned from other dimensions unknown to humans, being a Conjurer meant being able to understand secrets that the world hides. Would it ever bring his mother back? He didn't know, but he had to try.

He applied to pregistious magic schools in Nisalvini, read up on complex studies about summoning, met and debated with experienced conjurers. During this time his father would deteriorate at an alarming rate, drowning his sorrow in alcohol, helpless in front of the impossible return of his loved one. Caleb would be there for his father as best he could, trying to ease his grief. His father would then slowly wither away after a few years, finally leaving him to reunite with his wife.

As such, at the age of 23, Caleb inherited all of his family's wealth and set off for Miras, joining the prestigious Academy of the Arcane. In no time flat, fueled by his ambition, he became a skilled Conjurer, earning the position of a reseacher. His success unfortunately inflated his ego, leading to him to a rash decision; he wanted to prove he could tame a familiar with power that far surpassed his own. The cost of his ambition was his left eye, which was replaced by a blue scar, his right eye miraculously spared thanks to the Mareus tattoo. Caleb had slowly regained faith in Mareus after multiple years (having nobody else to rely on), but this incident was proof for him that maybe She was truly watching over him - just as She had once watched over his family.