Each Made Their Choice One Wiser Than Others
Harry Potter after the battle of Hogwarts collected all the Hallows. Unfortunately for him no one mentioned that collecting the Hallows doesn't make one the Master of Death, but Death itself.
The wizarding world is as fickle and foolish as ever, nothing's really changed. So Hadrian shouldn't have been surprised when he was sentence to the Dementors kiss. After several failed attempts on his life he was proclaimed Undesirable Number One, again mind you.
The first time all the Hallows touch his person Harry was thrown back in time to before earth even existed, he was sent back to the death of the first being.
Hadrian was very annoyed, he was suddenly cast into the void by what had to be the worst form of travel imaginable and left alone for far to long so he through a hissy fit.
Thor and Loki were children watching their father fight the Jotuns. Neither noticed immediately, but the fallen soildiers started rising desipte wounds, they thought it was some form of magic and were in awe. Until they noticed that it wasn't only their soldiers rising.
Several thousand of years later and finally the cause of the disterbande in the cycle was found on a place no one had seen before, a place the entity call Midgard and that entity's name? Well he called himself Death.
MxM don't read if you don't like.
Harry Potter cross over with Thor