A SEAL?

The voice came from the sky while Devan was approaching imminent death, and Ilia Perli was sent flying. The soldiers, gobkins, and shadows were still fighting the Skywalkers when they realized that the Calamity Spider was descending.

Amelio and the rest stared at the descending metallic monster and watched runic circles appear on top of it. Then, the voice addressed the Skywalkers fighting against the soldiers and Arthur's followers.

"Those who came from the other world and followed the Fallen God Amelio," said the voice from within the airship. "I have been to Alka, so I understand better than anyone on Earth that you have been forced to do this by the calamity. However, you have invaded this place and harmed the citizens. Retreat at once, or the onslaught will begin."