Can't remember much of the novel but the mc gets an ancient green eye which is part of a set of 9 other eyes or something. Remember an arc where the I'd goes into the body of an ancient race that the eye is from or something an there's an inheritance in the heart iirc. If anyone knows this it would be appreciated.
Second Coming of Gluttony also have mc with 9 eyes power and first eye power is green but it's definitely not what you are looking for.