Avolon: Os-Nadarra Prime Volume 1
"this is only the first in a line of combat retrofits; soon, there will be many of these sentinels of the skies, including our next two hmas city of avolon and hmas unity of phoenix!
Hurricane Kim Chapter 23
She had set herself up as a sentinel, over kim in particular, to begin to make the amends that i could feel that she wished to make. i knew that before long she would want to speak to me about it.
They Came From the Pages
It must have looked utterly silly to see someone who looked like a robotic sentinel fleeing from little mummy ponies.