So Waver has this blob of mercury that can be used as a weapon...but he tends to use it as a housemaid. Would he be able to get that back with the weapon capabilities taken away/deprogrammed in some way?

oops oops you know what let's make that just entirely nonmagic since I just now see nonmagic is a thing. So like. Just a blob made of mercury that is totally good for nothing but being a puddle.