the exploder, a infected that was in experiment with the rsu, the rsu was testing with a normal infected, they were adding chemicals acids and etc. but when they added a acid to the infected, its body arms and legs inflated, the exploder is slow due to the weight of the acid, but it can cause great damage to the victim, it had 2 attacks, it spits out acid, or it explodes, when the victim is expose to the acid, they feel like there on fire, it gives time to the infected or another infected to eat the victim, the explode range is not that far, and its rarely spotted by rsu or mgf around the infected town, it has over 1000 liters of acid in there body, there is 30-40 of these lurking around the town for there next victim