The E-virus Tyrant's spine and limb bones are exposed at some points. Even though that may be a weakness, the bones can streach far, like it's a rubber band. Much like the E zombies, the E tyrant has claw-like fingers, and can jump high and far.
The objective of the E Tyrants is to spread the infection. When an E Tyrant stabs somone with the large claw, they are injected with the virus.
- Resident Evil: Graevf File 2