The Citadel of Chaos

In a blinding flash you realize that the bite is deadly
and you sink to the ground clutching your wound and writhing in agony.
As the poison takes effect, your head swims and consciousness fades.
You have survived, though fortunate, you are not un-scarred.
Your body is wracked with pain and you must either

offer your opponents a gift from your backpack,

or leave the room quickly by the other door.