In short:
This is why cultures have both feared and worshipped the key. It unlocks ecstasy, yes. But also vulnerability. Also the raw knowledge that you are, at your core, a creature who wants. And wanting is dangerous. carnal instinct key
The developers intentionally made the Carnal Instinct Keys scarce. They are not sold by vendors. You cannot craft them. You must earn them through high-risk gameplay. In short: This is why cultures have both
Please provide more context, and I’ll assist accordingly. at your core
: Found in the Northern Tomb during the Footsteps of the Dragon quest. It unlocks a shortcut back to the tomb's entrance.