Ch 30
READ ASURA SCANS VERSION FOR CONSISTENCY and better quality translation
In ch 26 is 5 years later, so he's 17
In ch 1 he goes 30 years back in time to 12 years old after Ragnar (5th prince with Ivory Tower backing) poisons him.
Looool I said this originally: Actually wait for 40-50 chapters, fam
The Return of the 8th Class Magician