Hello! The ghostly titans by the beacon and the ones by the wall are the same breed of phantasm — from afar, they look fairly nebulous and amorphous, as if they're made of light and power. If you get very close to them (think, close enough to stab or at most 2 meters away), you'd be able to spot a skeletal infrastructure through the translucent (but surprisingly resilient) matter that surrounds them. So they look as if they have some humanoid skeletal features, but they are not human!