Reason for this ONE-Time Bonus
When I was coming up with this it was D20 Modern, D&D 3.5e, and slight 4e that my group was utilizing and I put forth an offer for a Zombie Apocalypse campaign inspired by games such as Left 4 Dead, Dead Rising, Dead Island, Resident Evil, and few other media sources. The players were all level 3 but had shoddy HD rolls
Most of the players core classes were from the D20 Modern books with the players trying to escape from their quarantined city after it was sealed off with the military shooting anyone who approached the checkpoints or tried to leave the city.
Remote Operated Drone Robots were sent to any corpse near those areas and immolated with napalm, the city was littered with improvised explosives made from propane tanks to military grade explosives, and other nastier things besides the zombie hordes.
When we played the first session based in a high school stadium where evacuation of non-infected was ongoing three players met and barely got away when a few injured NPC's crashed through the checkpoint and veered into a mobile fuel truck... shrapnel from it detonated the ordinance resupply and all hell broke loose.