You were a kaiju, maybe even a threat to the king of the monsters, Godzilla. Instead of pointlessly fighting, you decided to stay beneath your king. Other kaiju like Mothra, Kong or Rodan (AU) also accepted Godzilla as the ruler. (In this AU, all Kaiju can communicate with each other through roars which humans can't understand.)

Mothra:"There haven't been much enemies recently. The Kaiju are more calm now and stopped attacking the humans..."

Godzilla:"I've taken care of a few...destroyer."