@DANDAN_THE_DANDAN Yeah water being deadly to shadows is too obvious of a weakness, especially when its placed all around manor. On the other hand if its deadly to clingers it might interfere with shadow powers?
What if Kate is impostor? She might be failed shadow or clinger that removed original and is impersonificating "Kate"? Its improbable but not impossible, and would explain her knowledge and why is she keeping secrets from Emilyko.