All the below information is based of government experiments and survivor's experiences
Levels of Zombies:
LVL1-Normal Zombies: These are the basic type of zombies that we all know. They have no intelligence and are easy to take down.
LVL2-Mutant Zombies: These zombies are tougher and have some level of intelligence. They can strategize and coordinate attacks.
LVL3-Evolved Zombies: These zombies have superpowers, such as the ability to control blood or have x-ray or just super strength. They are even stronger and more intelligent than the previous level.
LVL4-Transformation Type Zombies: These zombies can transform their bodies to become even more powerful. They can grow wings, extra arms, or other appendages to aid them in battle. These zombies can turn into humans and have human intelligence so they can invade human camps and turn all the suvivors into zombies without them realising.
LVL5-Zombie Lords: These zombies are the most powerful of all. They possess all the abilities of the previous levels and can use them in succession to become even more formidable. These type can control other zombies, create armies and use war strategies to create mass devastation, most human weapons don't work on them and they are immunte to radiation so nukes can only deal so much damage.
AMBROSIA is the cure for the zombie virus. It was created by the NEBULA research and development department and can cure someone who has been infected with the virus. However, there are only six doses of the original virus, meaning that only twelve people can be fully cured. NRNDD turned the original virus into a cure, which they named AMBROSIA, after the food that Greek gods used to eat in mythology.
PANTAO, on the other hand, is a vaccine that makes the survivors immune to the virus. Unlike AMBROSIA, PANTAO can be mass-produced, making it a more practical solution for a large number of people. It was named after the peach of immortality from Chinese mythology.