When the final Basilisk was slain nearly 200 years ago, the blood of the violent beast dripped onto the soil and took hold of the dirt. It stained the mud black as it dug it's way deeper, seeping between the gravel and grass roots to settle just below. When spring came and the wildflowers were starting to bloom, the Basilisk blood was tapped into by an unsuspecting weed. Like a parasite it drained the root of it's life, giving the Basilisk blood enough strength to wind it's way up through the stem and into the flowering bud. An unsuspecting child saw an odd colored flower. She picked it, taking the blood along with her, and returned home to show her mother.
The older woman was no more suspicious of the odd bloom. She thought it beautiful, and placed it in a glass of water to keep until her husband returned in the evening. The blood festered inside the weed, every cell pulsing with life, yet allowing no water to enter. The flower began to wilt. It was going to die, and the blood along with it. Thin thorns began to break through the dying stem, the Basilisk blood desperately trying to escape. But it couldn't fall into the water, lest the liquid thin out the blood and render it powerless. There was nowhere to go. The mother noticed how quickly the odd flower was starting to fade. She reached for the plant and lifted it from it's glass, then dropped it in shock as something bit her.
She quickly studied the wound, ignoring the flower as it bounced from the table onto the ground. One large hole, already gently seeping blood, had been carved into her thumb. The Basilisk blood had found a new host to devour from the inside, and it raced through her veins in search of her heart. Over the course of three days the mother grew ill, claiming she was burning alive yet having no fever. She rested in bed, clad in very few clothes to stave off the unbearable heat. The doctor came at the end of the week to see her.
"Of course you feel sick, of course you feel ill! You, my dear, are with child."
Nine months later, the mother goes into labor. The child comes out with snow white hair and wailing like a banshee, waking the animals surrounding the home and sending quite a few into a panic. Leviathan was born nearly 200 years ago, and is the last living creature to carry the blood of a Basilisk.