You can not be killed by Werewolf attacks.
Player guide
The Blood Oak might sound like an easy card to satisfy: Kill a person every 3rd night, and survive the game. However, this does not come without its hindrances.
The villagers fear that you might kill some of their own, a seer or bodyguard might even be the victim of your killing! And of course, they would want to get rid of that fear.
And meanwhile, the werewolves are just as, if not more, scared of your lethal power. Since they can´t kill you at night, they´re powerless to get you to bite the dust during the night time!
Since you´re a chaos role, no team matters to you. Choosing to side with the villagers or werewolves, or deciding who to deceive, both paths can lead to victory.
Therefore, your speech is your most powerful ally. The town will know that a Blood Oak resides in the city, and can quickly after some killing deduct where you are. Therefore a dialog with the city is often a safe path to survival. You´re not a werewolf, and therefore not essential to kill, to make the town win. And with good cooperation between you and the rest of the city would often benefit both. But remember, what you say, and how you act doesn’t have to line up.
Backstory
In the outskirts of the forest stood a solitary tree. It's roots dry and frail.It's sturdy branches fit for lynching, the nearby town often gathered around it in times of turmoil and strife.
One day, a crook met by the tree with his mistress, who had seen through his deception. As the steel knife slit his throat and the blood poured into the undergrowth, the thirsty roots had no other choice but to drink the crimson waters.
It was there and then that the tree first got its taste for the vitality of blood. And the next time an exhausted farmer laid his head to rest after a long day, the tree decided to snap his neck with its vines and drag his corpse down into its roots for nourishments.
Weeks went by, and the tree grew strong and sturdy. Reports of missing children and harrowed screams led many to comb the forest for bandits and brigands. But none suspected the tree itself, and as it grew it size, so did its thirst.
It remains unclear if the tree had been possessed by evil, or simply turned to malice as its only way of surviving. But all that lived near it lived in fear, while those living in a safe distance often saw it as a means to an end...