Vanilla is a product of Lussumo:
Documentation and Support.
I would think that this does not preclude Kait from reading minds to find out what they did, when they did it and to whom, which would indicate to me that Kait's pool of torture and death is less about extracting information and more about punishment.See, that's why I took it to be less about anything else and more about how she wants to have a bit of disturbing fun playing at Interrogator. If it's about punishment, why wouldn't the other 'Angels be involved? She clearly kept the area a secret from the others, and described it as a place she needed to take people to talk to them. It seems fairly clear this is her little torture-pen for extracting information.