hello /sci/ I need help
I am writing a story where an endgame videogame boss gets "isekai'd" into a world with technology very similar to ours. after humans drop a nuke on the boss they discover that they would need "six million MEGAtons of tnt" to kill the creature (because in the game the boss had six million HP) however I just wrote that number, I'm not entirely sure how much energy that is, I tried looking it up but didn't find much. could you guys give me some context as to how big of an explosion that is? I need to know this before continuing my story because if it's too ridiculous I'll have to change the number.
thanks