Shadow Stalker and Dark Thorn

The Shadow Stalker is a boss from Kingdom Hearts 2.

Bearing an extremely close resemblance to Darkballs, a fellow type of pure Heartless that failed to appear in Kingdom Hearts 2, the Shadow Stalker was the first boss of Beast's Castle. Called upon by Xaldin, the insane, chandelier-like creature attacked Sora and his friends by possessing the windows, pillars, and chandelier of the castle ballroom. Upon being defeated, it transformed into the fearsome Dark Thorn.