As per tradition, Ozymandias sends Eren a present. It's a box wrapped in golden paper and inside Eren will find a beautiful silky robe with some bird symbolism, meant to be worn after a bath or a shower. There's also a fancily written invitation to join him for a bath at the Pyramid House whenever he wants.

"I thought this might suit you. Happy Yuletide, Eren. - Ozymandias"