By some stroke of fate, Thanatos find the letter before any of his roommates do. He reads it carefully multiple times and even talks with Mort about it. The letter goes through a few drafts before he's satisfied. The lettering is neat and crisp.

To Raven,

I had not realized I have been causing you pain. This place brings up memories better forgotten. If this shielding is something you are willing to teach, then I will attempt it.

Thanatos

It doesn't go into detail into why or what he's feeling, but he hopes secrecy can be allowed in this case.