Whoa! I remember this being a game you maybe worked on, which is my only reference for it (and the other art you shared). But this production art makes me super intrigued about the actual game/gameplay. Cool cast of characters!

Yeah, it is my favorite game that I worked on in my 26 years (and going) in the video game industry.  It went from N64 to GameCube to Xbox to Xbox 360.  Basically a war between elves and trolls with the main character having the ability to capture and evolve over a dozen elemental warriors.  The fighting and combo system was pretty deep allowing you to start combos with one monster and shift in another (or two) to continue the combo and even juggle enemies in the air like a Capcom versus title.  Definitely one of the prettier Xbox 360 launch titles.  I actually have a playable demo of the game that runs on the original Xbox before it was cancelled and moved to Xbox 360 to fully realize the original scope and vision of the game.