Rune Devourer

The world is full of wonder but Grey is forced to live in the underbelly of such a wonderful world due to his inability to sense the mana around him. He is shunned and mocked by the world but he doesn't lose hope.
His hardship finally pays up as he awakens the legacy of now already extinct variation of magic, Runic Magic in the form of the system.
[Beep!! the host has fulfilled the condition for obtaining the legacy being the only person without the ability to sense the mana and not losing hope even after getting ridiculed by the whole world.]
[Beep!! Initializing the system...]
[Beep!! The Runic system has been successfully activated.]
Join me and our character as he utilizes the now-extinct legacy to enjoy the wonderful world of magic.

(English may be broken with several errors. Help me correct those errors if you were able to find out such errors.)

[Thank you very much]
[Book cover is from AI art generator. So, help me if it belongs to someone]