"Now we must take, ah, heh, a pretence at defending the island as if we were defending our comrades. But they are safe, so we shall make a defence of this vast land as part of our last stand, well hopefully not the last, but a stand nonetheless. Why they seem to wish to attack me so I simply cannot fathom. Either they are evil, maybe involved in oppression, repression and persecution, or they think of me in similar terms, the origin of the latter I cannot begin to have an idea about. But needs must and we must prepare ourselves. They probably know exactly where we are, especially if they have any intelligence. Let us begin!"
Tesla caused a wall of water to rise up from the sea, which when people got within a kilometre of it, would spurt water at them at high speeds and masses.
Tesla rose his arm upwards, holding his palm open, then lowering it. There was a faint sloshing sound as an aerial barrier hit the ocean and then went into it, blocking entry from underwater as well as from the surface and the air.
Haraldur caused the sea beyond the wall of water to be very turbulent, and when someone was above it, water would be spurted up towards him at high velocity.
In addition, he caused there to be a large storm, the fitting the whole country within its eye, and surrounding it with swirling winds and clouds, and lightning strikes.
As a finishing touch, Haraldur caused an invisible field to surround all the defences and beyond the defences. When this was breached (and the people would not have got to the defences yet and would be quite safe), it would speak thusly:
The nation of Aspyes bids you welcome, and thanks you for your thought of paying a visit. However, there are things we are busy with at the moment, and we would emphatically prefer not to be disturbed. If you are traders, rest assured we will arrange deals at a later dates. Please leave and come again, thankyou
Afterall, thought Haraldur, if there is a possibilty of death, why not have a laugh?