Tempest and Jason Grace are such an underrated Pegasus/demigod duo.
It's the fact that Jason claimed Tempest as his hourse/companion in the very beginning of his journey, and basically died falling off of Tempest's back just hits hard.
It's the fact that Tempest also went searching for Jason's body and brought it back to Malibu.
It's the fact that Tempest flew off after his master's death, never to be seen again.