I just reread Blood of Olympus and want to point out that Orion says everyone died in his attack. Thalia Grace was on the perimeter lines when he attacked- and they said they lost all contact with those lines because everyone was dead.
So Thalia died. There wasn't a tree this time.
Ignore User
Both you and this user will be prevented from:
Messaging each other
Commenting on each other's stories
Dedicating stories to each other
Following and tagging each other
Note: You will still be able to view each other's stories.