Relic Overtaken

An orphan named Souo Kaizewa suddenly gains ridiculous powers from the natural magic energy left behind by an ancient god. Souo's fate changed after gaining this power which made his body become a slime that could stretch and attack small magic attacks but was immune to ordinary iron swords and arrows. Souo entered the Seirei academy to learn magic and swordsmanship but he was always underestimated because he was a poor person who entered a noble academy. Note: I'm still a beginner so please understand if there are mistakes