Recommendations need a recommendation for a revenge novel.

[era]

need a recommendation for a revenge novel, something like his clan or family being killed in front of his eyes.

 

[Horny_Gentleman]

Reverend Insanity
Rebirth Of The Thief Who Roamed The World

 

[TheEldritchGod]

Tʜᴇ Sᴛʀᴏɴɢᴇsᴛ Hᴇʀᴏ Wʜᴏ Cʀᴀᴠᴇs Rᴇᴠᴇɴɢᴇ

Exactly what is says on the tin.

 

[MoMoKushBear]

Wandering The World is a revenge novel if you wanna check ot out.

 

[CarburetorThompson]

Übel Blatt

When Wischtech threatened to invade the fiefs of Szaalanden, the Emperor dispatched fourteen youths. Of these, the Seven Heroes halted the invasion to herald a time of prosperity while the four Lances of Betrayal were supposedly defeated. Two decades later, the Lances of Betrayal have reappeared...

myanimelist.net

technically a comic not a novel, buts a really good revenge story