Once awakened, they must also never to use the other dragons' hibernation to their advantage to invade their lands.

Air-breathing arthropods evolved and invaded the land where they provided food for the carnivorous amphibians that began to adapt to the terrestrial environment.

The saints had invaded their land and were declaring their wells as sacred.

At the start of it, the skies got dark as a great swarm of locusts shaded the sun as they invaded the land.

Those encounters might have not been favorable and set the stage for hostile and aggressive attitude towards strangers invading their lands.