It’s basically transcendent superhuman physiology, like Superman 1,000,000

Were do these beings with this power fit on the cosmic hierarchy

Depends on the writer, the comic series and the character, but like Marquis of Death might fall in that category and he was powerful enough to fight and control cosmic entities. So its very variable but potentially very high on the power scale

What type of entities can beings with this power slay .

Basically any given the character and the writer, it’s transcendent so it’s on roughly equal level to all the other transcendent physiology’s

It's transcendent super-powered being physiology.

@Can Perk transcendent meta is for all transcendent super=powered beings. What you're thinking of is transcendent superior human.

That's why I was so confused with this power .