Akthuri's deep pain and suffering was caused by a series of truly heartbreaking events that involved his parents, and one important woman. 
 

Akthuri did not know the love of a real family, and this had a great impact upon his life.
His parents were not in love, they simply consoled one another during difficult times in their lives.
And Thuri was the result of their "fun". His father, being a High Elf could not bare the thought of having a child with someone not of his own race, and therefore left without warning before the child was even born.
His mother however, being a human, had a gentle heart and could not even bare the thought of abandoning her child. She kept and raised him until she felt he was ready to study in Dalaran, the City of Mages. Thuri studied there from quite a young age and excelled in Arcane due to his heritage, until one day he received word of his mother, the one person in his life that mattered, the one person, who cared. She had been killed, mercilessly slaughtered.
By whom? No one knows. Why? No one knows.
Thuri however, is determined to find out who, and has been searching ever since.

 

There came a time in Thuri's life, when he found true love. His first love, in fact. Her name was Niriem, a Kaldorei Druid whom loved Thuri for who he was, accepted him and cared for him in all ways. They spent day after day, year after year together and when he was with her, it was as though he was reborn anew. All of his agonising pain was gone, she took it all away and filled him with love, it was perfect, soul mates, truly.
But it wasn't to last, Thuri was still only young, 18-19 human years at the time, so he went back to Dalaran to study, to become better at what he loves, perhaps even fullfill his mothers hopes for him; to become an Archmage. While he was there, the same thing happened, his love was murdered, brutally at that, not much of her body left at all. He returned home to find her corpse, which was in fact cut into many, many pieces. What beast could do such a thing? Thuri has his suspicions, as it was extremely similar to the death of his mother. 

 

With the death of the only two people that ever accepted him, loved for him, cared for him gone Thuri went insane for a time, and wandered the wilds, searching far and wide for clues, anything that could lead him to this monster. However, one day he snapped out of it, and kept the "insanity" merely as an act, a disguise he could wear so people would not see him as a threat. He was like a babbling, enthusiastic old man that simply loved fire, yet seemed truly harmless. His true self, is focused and calculates every thought, every movement he makes.
Carefully and steadily progressing in power, hoping to find the killer of his loved ones. His dream? To hold the entire world in his hands. To be the one that controls every aspect of it, to rule, as a God. His Reason? To find the one individual responsible, for his pain, his suffering...