TAKE MY IDEAS AND THERE WILL BE CONSEQUENCES

The things need a name!!
I'm planning to make them a species, but I can't think of a a name.
So how this is going to work, is you guys can comment down a name for them, (you don't have to but I'd like it if you do ^^) and I will choose whichever I feel fits them the best. The winner will get a custom of this species!!

Until the name is chosen I'm just gonna refer to them as "things" x3

Here's their main info (I won't get into a lot of detail, this is the main info, not ranks and extra abilities. That will be included in their ref sheet after the name is chosen.)

•They are able to walk from dimension to dimension, world to world, and can travel to ANY point/period in time, and can show up ANYWHERE. However They can only do this twice every moon-cycle (month)

•They are pretty much Reapers. They take the souls of the dead, and catalogue them in their catacombs, which are pretty much a library.

•They weren't always like this, they were humans before they died. But when they died their souls were corrupted and changed, and they turned into these.

•If a human is able to guess the human name of the thing, the name they had before they died as a human, the thing will then serve the human in any way until they die. This contract is bound by the strongest of magics. When they die, the thing is then permitted to take the humans soul, and eat it.
This is the only time a thing is able to eat souls.

•The things lifespan is determined by how many souls they eat. For example, if they eat a soul that belonged to a human who had lived 50 years, 50 years and an extra 5 years is then added to the things lifespan.

•The only ways the things can die is if they don't eat souls, or another stabs it with its tail, which contains a toxin thats so strong just a few drops could kill thirty humans in seconds at skin contact. They can also be killed by magical duels between others of their species.
These are the only things that could kill them. Otherwise they could live forever.

•They can use any kind of magic. However only two can share the same. For example, if one thing had fire magic, and another had fire magic, ONLY THOSE TWO would be able to use THAT SPECIFIC MAGIC. Until One dies, no others will be able to use fire magic.

•They can change form to suit the dimension they are currently in. However they are distinguishable by their ranking marks, which are magically branded into their skin and remain there throughout their appearance changes.
They can only change shape to the most popular indigenous life that exists in the world that they are in. For example, in the human realm, they cannot be a dragon from Pyrrhia
(I KNOW HUMANS EXIST IN THE WOF DIMENSION/WORLD BUT I MEAN MODERN CIVILIZATION AND AM TRYING TO MAKE A PIONT SO BEAR WITH ME)

Physical Features:
Their wings are part of their cloaks, which they never take off. When not in flight, their wings become part of their cloaks. They have the texture of worn leather.
Their tails as mentioned are incredibly deadly, and are the only things that could kill another thing.
They are long limbed, and covered in fur, except their faces, which are covered by what used to be their human skulls.
They are REALLY tall. Adults can be up to 14 feet tall, and 23 feet long including their tails.

(There's a height ref IGNORE THE OTHER STUFF ITS IRRELEVANT ^^)

Okay!! I hope that isn't too much info For you guys XD

Remember! Name I think fits the best will get a free custom of this species!!!