Camelot Unchained engine supports 10,000 characters on screen
Camelot Unchained has a custom engine, a bold move designed to support its core conceit: genuinely massive player battles. In a Kickstarter update, Mark Jacobs shared a video showing off how the early engine tech can already support 10,000 characters on screen with no frame-rate drop. It comes at the cost of fancy lighting and effects, but the MMO's signature, core feature is clearly possible. Take a look through the link.
Thanks, Massively.