For a creation of the Black Tide of Acqua,death never truly befalls it. As long as the most vital part of it survives,the foul thing will continue to exist. In a certain sense..
The dwarven gods true names can only be known by dwarves. They are referred to by nicknames in the presence of non-dwarves. I.E. Gudurran( Allfather) Baenna ( Hearthmother) Dudrak ( Ore), etc. No torture or magic or direct intent can reveal their true names to non-dwrves.