Timeskip

It has already been 5 years since I've killed the dude with the black hole ability. After I killed him I started to go around and eat everything I could. I especially used the black hole ability so I could eat a lot more.

Part of my time was used to find more useful ways to use my abilities. I used my various elemental abilities to create a tsunami, earthquakes, and other disasters which destroyed cities. This created a lot of negative energy which I absorbed and refined, I did however keep some so I could use it to spread plagues. The other world powers tried to nuke me, but I had already gotten strong enough to resist the blasts. But, when they shot those nukes at me I just stopped them with time lock and stored them in my inventory, they'd be useful later.

Anyways, after training my abilities I started to just devour everything. I devoured huge amount of water from the ocean which included fish among other things. Eventually I got to the point where I started to devour entire continents. It got to the point where the whole planet became barren. I had ate the whole surface of the planet so nothing was left except for a little water.

There were a few ability users that I got some useful abilities from. Them being an ability to alter my gravitational field to fly and a shapeshifting ability. With this ability, I wasn't afraid to go into space because I could just not breathe because of the amount of energy in my body, and my body can resist the temperature in space. So, I began flew out into space and used a huge amount of energy to compress the whole earth into a single point to devour it.

I wasn't surprised when I started to grow at a rapid speed. I eventually grew big enough to circle around earth once with my body. That's when I began to go around the solar system to devour the other planets. Over the next couple years, I devoured the rest of the planets in the solar system and grew so big I could circle Jupiter once in length. Which means I was 439,264 Kilometers long and 61,497 kilometers in girth. I was massive.

Present Time:

Now that I have gotten decently powerful I think I should go to another world now. I've thought about it for a while now and I've made a decision on what world I would go to. I first thought about going to the Highschool of the Dead world first, but there was nothing I could do there besides gathering large amount of negative energy. I already have a large amount of physical strength and negative energy from earth. Now what I need is new abilities which I can fuse together.

Next, I thought about going to Highschool DxD, but I thought about it a little more and realized if I crossed over now, then I would definitely either be experimented on, or instantly killed because of the amount of strength the higher beings in that world have. I asked the system earlier about the strength of different worlds, and the system explained it to me. There are 9 tiers of worlds, first being the worlds with no supernatural, Tier 0. Kind of like my original world, there were no supernatural, it was only regular human beings. The next being Tier 1, which was my current world. My current world had supernatural people, however they weren't that strong so the world was only tiered at 1.

Apparently, the higher the tier of world the stronger the world is, and the stronger the beings in the world are. So, for example if one of the four Satans from Highschool DxD had the ability to travel to lower tiered worlds, they would have the power to destroy planets or solar systems with their power instead of small countries. This is because their world is more durable, so their power won't do as much damage to their world as opposed to lower worlds.

The next world I thought about was That Time I got Reincarnated as a Slime. After thinking about it for a while, I realized this was probably the best world to go to. First, the world already had people reincarnating and transmigrating into the world. So, if I go to that world it would not be that suspicious since it is already a regular thing happening. The second thing is that I would be able to stick with Rimuru. Don't get me wrong, I'm sticking around with him so I could follow him around and be his yes-man. I'm sticking with him because of how powerful he got in such a short amount of time. He is super naïve and it would be a piece of cake to be his right hand man, little does he know that he's going to be a juicy snack once he gains some powers.

It would be easy to devour him and take over his Monster Kingdom then I would have the chance to farm some positive energy. I could even make them think I'm some kind of god and have them worship me. It would certainly be a fun hobby making monsters go to war with the humans and watching it all play out.

Anyways, I'm done babbling so let's just go ahead and travel to the next world. So I used Devour on the space around me, it used a lot more energy than I expected, however I still ended up devouring it. As soon as I went through the whole in space I thought, 'System, send me to That Time I got Reincarnated as a Slime.'

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Finally, we are moving on to the next world. Hopefully you guys understand my reasoning behind the choice of worlds. I'm somewhat familiar with this world, but I'll still read up on some more of it so I don't miss anything.