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According to this surviving the core of the sun which has a temperature of 15 700 000K is Multi-City Block level+
Rimuru's Hellflare exceeds that by a lot, as his Hellflare has temperatures of several hundred million degrees:
"Then an ebony darkness covered the statue. Ignoring the surprised elementals, I launched a Hellflare at it. Again, a move I mastered from Benimaru. Focusing my concentration to a razor's edge, I kept its range as small as possible. Such focus wasn't necessary if I was just using it normally, but defining a specific range required full control over a massive amount of magicules. A dome about ten feet in radius, a size so compact not even Benimaru could conjure it, covered the statue. Even this was something I could only pull off with the help of the Great Sage. There was a massive foom sound, and when the dark dome disappeared, nothing remained. According to the Sage's calculations, the temperature inside the dome exceeded several hundred million degrees, enough to create a burning hell that vaporized everything in an instant. Even my own Cancel Temperature would be worthless against that. It was the strongest attack skill in existence, one nobody could ever resist. Not too useful against oversize monsters like Charybdis, but still. Its main weakness was how easily avoidable it was; it took long enough to create that simply running away worked pretty well. You couldn't just throw around an attack with an inherent weakness like this, or else your opponents would figure out how to deal with them. I had to save the big guns for situations like these."
As a good lowball, i think Rimuru should be Low 7-C with Hellflare, since the original calc of a far lower temperature is close to being Low 7-C.
Rimuru's Hellflare exceeds that by a lot, as his Hellflare has temperatures of several hundred million degrees:
"Then an ebony darkness covered the statue. Ignoring the surprised elementals, I launched a Hellflare at it. Again, a move I mastered from Benimaru. Focusing my concentration to a razor's edge, I kept its range as small as possible. Such focus wasn't necessary if I was just using it normally, but defining a specific range required full control over a massive amount of magicules. A dome about ten feet in radius, a size so compact not even Benimaru could conjure it, covered the statue. Even this was something I could only pull off with the help of the Great Sage. There was a massive foom sound, and when the dark dome disappeared, nothing remained. According to the Sage's calculations, the temperature inside the dome exceeded several hundred million degrees, enough to create a burning hell that vaporized everything in an instant. Even my own Cancel Temperature would be worthless against that. It was the strongest attack skill in existence, one nobody could ever resist. Not too useful against oversize monsters like Charybdis, but still. Its main weakness was how easily avoidable it was; it took long enough to create that simply running away worked pretty well. You couldn't just throw around an attack with an inherent weakness like this, or else your opponents would figure out how to deal with them. I had to save the big guns for situations like these."
As a good lowball, i think Rimuru should be Low 7-C with Hellflare, since the original calc of a far lower temperature is close to being Low 7-C.