Just a dude who reads fanfics. I also write them sometimes.
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A good way of collecting souls could be to bargain for them with a Daemon or Guy. You could also just go around killing Bandits for a couple years all over the world. Tensura is mostly a traditional fantasy, so finding a hideout of a hundred or ao of Bandits, while not common, should still occur. Doubly, so if you go after evil organizations. It would also be a good way to raise your MCs reputation. For the atmospheric catalyst I think it's doable, but remember that most top-tier characters will have some kind of Natural Effects immunity to block natural phenomenon or Law Manipulation to control the natural laws of the universe. Finally, if you are planning on helping during the Tenma War, just remember that most countries don't survive them, so if you have to good reputation from the earlier stuff and then are seen fighting them, you could manipulate the situation to become a public champion or even start your own country. Carrion is a good guy to ally with, but remember that humans won't take too kindly to friendly relationships with a Demon Lord and Rimuru had to jump through quite a few hoops to get on friendly terms
Lol, I don't really think there is much to teach, all you need to do is research Tensura a bit to start your own fanfic. Here is what I'd do: 1. Watch the anime, this will give you a good overview of the events and plot. After Rimuru becomes a Demon Lord in Season 2 is the best place for divergence into your own unique direction. This is because technically everything before that will be in an alternate timeline which Chloe will inevitably reset via her Time Loops. 2. Watch/listen to one of the Tensura YouTube channels (Manas: Ciel is my go-to) for some of the later content if you are going to be following the main story more closely. 3. Abuse the wiki. The anime doesn't explain a lot of things that the wiki can help you fill in. For example, Arts, are non-skill techniques that people use in combat and can combine magic and skills with. This is completely ignored in the anime and arts are very useful for punching through defenses that would otherwise be 'invincible' such as 'Physical Attack Nullification'. Other than that, have fun. Try not to write people out-of-character too much without an explanation for why their character changed
It was explained in an author comment before, but I absolutely hate the whole will-they-wont-they part of the beginning of relationships and am terrible at writing them, so I just kinda skipped it since most of the fic I wanted to be about them while they are together not them beginning to catch feelings, talking, and working up to a confession, etc
Slime
Minotaur Woman
Minotaur Man