Ghosts

" Ghosts travel in packs. It's the first thing you're taught when you become a Striker." -Talin
Ghosts are inhuman, created and experimented on by the Federation.

Ghosts are humans turned monster.

When a citizen of the Federation dose something to offend the Primer, he takes them and their family to get turned into Ghosts. "Ghost have white skin and their eyes are clouded and milky. Their teeth are grown out long over their mouths causing them to be in constant pain. Thats how you know they're coming, the grinding sound".

"Their ears are long and pointed. Their limbs are grown out to regrow in a spidery shape. Their skin is cracked and bleeding. Their hands extended into claws."

"Their eyesight is poor but their hearing is suburb."

Poison injected into their blood that makes them want to kill humans, but not the Premier. The premier has a link to every Ghost so he can give them orders on who to attack. "The power of the Premier's mind stays, even if dead, so the Ghosts can keep killing." -Red talking to Talin