I finished issth some time ago and there is something I wonder. Mc returns to his sect, and there are bad guys(sect's bad guys vs sect's good guy's arc - they want to banish MC). He casts a spell which creates giant suns outside and enters to the elder's hall to discuss. I still think about those fireballs. Why did he create these huge fireballs? Could he possibly destroy elders if they were to fight? What was his plan at that point? Isn't elders are much stronger than him?
IIRC the sun could continuously absorb heat (kinda like genki dama) and it reached terrifying magnitude. Meng Hao used it for safety measure I think.