Attack On The Ackerman

"You're an Ackerman?!!!" Tobi pushed his sister away in confusion, "Yeah I am, look!" Crystal point at her left arm and there was a scar of the picture of a minute sword on the side her shoulder, "You're my master too!" "I am?!!" Tobi, her brother was shocked,
"Check your back I sense it's there" Crystal raised her brother's shirt and lo and behold there was a tattoo of a sword drawn on his spine!
"But... This is dangerous..."
"Why?"
"If anyone finds out you're an Ackerman... You're going to get killed... Sis"
...
Ackermans... great warriors, awakened humans that received a blessing from the god of the Ackermans but turned their backs against their god and proceeded to live a life of malevolence and chaos nearly plunging the world into darkness.
Narrowly the world escaped the war of the Ackerman which was called the "Pandemic of Death", and put an execution to all Ackermans that roamed the earth which led them into exile.
Why did they attack the world and cause several generations after them to suffer in the world?
"I'm afraid the curse has affected your sister..."
"We still have time right?"
It was the curse of the Ackerman that caused the pandemic of death on the earth, it turned Ackermans to monsters and depending on the power of the Ackerman the dangerous the monster becomes,
Having found out his sister was affected by the curse, Tobi arises to find a cure before she turns into a dangerous beast that'll endanger the whole world.
On the journey of finding a curse mysteries to the power of the Ackermans are slowly being uncovered and mysteries about the world that they live in...

[ And yes the character there is the boy, I know don't judge me, he's a sweet guy trust me]

[ This author is going on a haitus, Very long break]