Flexibility and Mobility; How do you raid/teleport without air or strong astral?

[K]

As a Blood nation with some access to astral, you might want to look into Horrors. They can destroy PD with ease and can demolish unprepared armies. Then take the undefended provinces with Imps via Horde from Hell.

Sure, it is a blood heavy strategy and so happens later in the game, but as a nation that does Blood, Nature, and Astral, the Path of Blood has many useful tactics (for example, see Rain of Toads for the easiest way to shut down enemy troop production).