Goblin Tenseiki (Novel)

From japan to an another world rusty was born as a goblin, and his gob life looks really hopelessy in a hard mode. However, after saving a loli elf, he started seeing a bright future. because an elf mother became his master, and he aims to become a great magician. adventurer extermination, dungeon part time job, hero subjugation….the protaganist is working hard but, sooner a phenomenon of a heroine having a reversal of role with the protaganist might happen. (from 9ethtranslations).