Clear Bloodbane Poison, The Unfathomable Kind Travellers

"The poison affecting your king is called Clear Bloodbane," Knight Mayril interjected, her tone cold. 

"When ingested or placed on the skin, it's a slow-acting poison that seeps into the bloodstream over several minutes. It attacks the entire nervous system, numbing the body to the heart. The victim remains fully conscious but is unable to move or speak until they are enveloped in extreme coldness and eventually die."

"Your king thought he was strong enough to delay the poison, but he hadn't felt anything because it was slowly spreading. The Sovereigness created this poison, and the cure can only be found within the Bastion of Wailing Gnarled. You shouldn't waste your time—it's hopeless. If you love your king, allow him to rest in peace or end his suffering swiftly," Knight Mayril added, shaking her head with an expression full of pity, though she struggled to hide the faint smile threatening to emerge.