The Nasuverse has the Mystic Eyes of Death Perception.
Those eyes allow someone to see lines, and with some more growth points, that allow the wielder to find and activate the very concept of Death. Of Non-Existence, if you will, as not only those with Life can die.
The only limitations seems to be the wielder's capacity to perceive said Death and how much their brains can take it.
Something cut on the lines cannot be reatached, fixed or healed. A cut limb can only be remade.
In Tsukihime, one of the most powerful beings in current existence was cut and could only survive by spending most of their power to grow a new body.
Another that basically became a combined goo of many beings, and thus destroying one of them would just need to be reabsorbed, could not re-absorb when they were cut.
In Garden of Sinners, seems like an experienced enough wielder can even kill the dstance between two places.
In Tsukihime, it can also reach the point of seeing points instead of lines. Those points are beyong what the human brain can understand for long, but with them the object is completelly dead. It soon turn to dust if physical. It was shown to also destroy poison and even a soul itself, although those can linger enough to try to strike back even if can't be healed.
Tsukihime also shows that Death Perception is different from Life Perception, as, ignoring the Death of non-living beings and the points being in different places, Life can be lowered with only hitting close instead of on the point itself, while Death cannot. It is either dead or not.
Tsukihime's wielder can reach a higher potential than Garden of Sinners', but it is because GoS' has the luxury of being able to turn them off.
Tsukihime's can't and needs special glasses to not see them too much, something that would lead to insanity. He can also force them to see better when needed, risking to overheat and shut down his brain, but also giving him access to sights GoS' can't yet - line the points of complete death instead of just cuts.
His inability to turn them off also lowers his life's duration tremendously, for even if he cannot see or use them with the glasses they are still active. He will not live for long.
Extra material also shows that as he grows older and more powerful even the glasses lose their power. Special bandages take their place, and even then still letting him see the lines through them.
The only real limitations seem to be the wielder themselves, who needs to understand the concept of death to what they are attacking.
And the more powerful the being/further from their death, the harder it is to see their lines/points.
