Destroying 2 world in tensura basically makes you 2-C because there is no Casuallty between worlds so every world has it's own time [ Space time Continuum ]
“ | They were governed by completely different laws, and there was no causality. It was a material world within a great spiritual world of many different civilizations. | „ |
| volume 17 / chapter 2 | |
There is also weird space between worlds.
“ | Velgrynd took her first leap into the strange space between unknown worlds.
There, she found herself unbounded by time and confronted her inner self. By doing so, she made the Ultimate Skill ‘Divine Flame King’ (Cthugha) completely her own. | „ |
| volume 17 / chapter 2 | |
And here you can at least say this is a Low 3 -A [ Which is a Tier that doesn't exist ] Feat at worst [ You can say this worlds are so weak they aren't even worth to mention ] but you still get 3-A simply because it's a Universe
“ | There were weak worlds that could be blown away by a True Dragon if it unleashed all of its strength, and there were desolate worlds where angels and demons comparable to awakened Demon Lords were in constant conflict. | „ |
Here you go Worlds are vast.
“ | The universe is vast, but not as vast as the other worlds. They thought that if they had gained a relying spirit and incarnated themselves, they could completely conquer this space-time within a few thousand to tens of thousands of years.
At the same time, they had developed the Underworld Gate, which leads to other dimensions, and had their sights set on a further invasion. | „ |
| volume 17 / chapter 2 | |
I dont understand this subject is not even worth to mention for me True Dragons should straight get a Low 2-C by canonical reasons too but I am not even gonna try.
And How do we know if the Heavenly Star Place is small it's just says its Isolated.
“ | you know you're in an otherworld right?
this is the star Palace the birth place of veldanava the star king dragon,it existed before the creation of all worlds,its adjacent to them,yet isolated | „ |
| Volume 18 / Chapter 3 | |
And yes of course If you destroy one world in tensura you can straight get a 3-A or if you destroy a whole dimension inside world you can get layered 3-A like 2-3 worlds of 3-A.
Hopefully I did explain myself.