The small memorial can be found in the new expansion.

Guerilla Games added a small but touching tribute to the late Lance Reddick. Reddick portrayed the character of Sylens throughout Horizon Zero Dawn and Horizon Forbidden West. Now, developer Guerilla Games included a little memorial to the late actor.

The memorial seems to have been added in the most recent update to Horizon Forbidden West. Specifically, the memorial can be found in the newly added west coast region in the Burning Shores expansion for Forbidden West. The update with the tribute only went out this past Tuesday, so if you haven't seen it before on your adventures, that may be why.

For those wondering where to find the in-game memorial, Reddit user Sfalj includes some directions on where you can go to find it. Be warned that the details about where to find the memorial contains some light story related spoilers for Burning Shores. If you have not yet played that content and plan to do so, you may want to hold off on clicking the link.