Austin Lake

Austin is a demigod son of Apollo. He and his siblings, along with the rest of the Campers helped fought in The Battle of Manhattan.

The Last Olympian
Austin is among the Campers that go to New York City and fight for the Olympians. He and his half-sister Kayla set traps along the Brooklyn Bridge led by their half-brother Michael Yew.

Austin probably survived the battle, and was commanded by the new cabin counselor Will Solace, his half-brother, to look for Michael Yew. His body is never found, but he is most likely dead as this seems to be the general opinion at the memorial.