The Strongest Sage with the Weakest Crest 19

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One boy will stop at nothing to be the world's strongest ... not even grinding! Matthias--formerly the world's strongest sage -- must now put his personal quest for power aside despite his mostly triumphant rebirth. By foiling a demon infiltration at the interschool tournament, he has brought down their wrath on the kingdom! But before he can protect mankind from the imminent invasion, there's housekeeping to be done! From dungeon crawling to amassing items, Matthias has to employ the skills that earned him the title of "sage" in his past life to rout the demons and their plot! --