Baylord Yama
Bayroad is basically the name of a hidden place where pit fights occur.
They don't actually fight using real dogs, but they call those that fight there "pit bulls/dogs"
It's called Bayroad because this arena looks like a road where pit bull/dogs bark (This is two sentences combined into one. Some aspects were lost. Wait for a full one from other people o.o)
One specialty about Bayroad is the shape of its arena.
It's basically a long strip of road where the dogs from each side fight each other to death.
They can't run away, as a field of sword/knifes await them on their sides.
These pit bulls/dogs are made through combining bloods ( a forbidden act in the Tower).
You basically inject "something" powerful into a fetus. You basically inject "something" from powerful families into a fetus.
(Not many know this practice. Because this is a forbidden act, those who know this went missing or was killed.)
Those children (most die from side effects) are raised as "eye candies" for those who visit the pit cage.
Baylord Yama was one of these children and the strongest pit bull/dog in history.
In the pit cage, he was the reaper who took his opponent's lives, so in respect they gave him the nickname, Yama (King of the dead).
Afterward, he killed his keeper and became the first pit bull/dog to climb the tower after successfully escaping from Bayroad.
Not much is known about how he climbed the Tower.
There are rumours that another slayer, Imort/Emort/something like that, helped him.
After becoming a ranker, he went back to the pit cage, and killed the owner to become the new one. He also became a slayer then.
(People guess that his final condition to become a slayer was to suppress the Bayroad.)
It is rumored that with the cash from Bayroad, he's building numerous secret nightlife facilities, further increasing his influence.
However, he hasn't been seen since after becoming a slayer.