Unforeseen Devastation mod for Half-Life 2

Quick Info
Game style: First-Person Shooter
Game Genre: Action/Survival/Horror

The story
New York, ca. 2015, an unknown substance is found in an inner-city park lake. It is regarded as illegal toxic dump, and is thereby inspected by hazardous liquid experts. Several hours later, one of the most interested scientists became insane for unknown reason. He; quoted by his fellow lab mates, suddenly became violent, he even attacked a small boy. Witnesses say that he grabbed the boy, bit him repeadietly in the forehead after tackling him down, and when his collegues tried to stop him, he threw up several liquids, blood being the majority, into the young boy's face. Of course, the boy, terrified, ran away before anyone could get ahold of him. The boy experienced severe pains and felt notious after a few minutes, folks down the street saw him and immedietly called for an ambulance. As soon as the boy was hospitalized, an enemy for mankind arised. The infection spread from creature to creature before anyone with political power could react. Re-animation, infection and extreme genocide, they split up cities, even states. Nearly 50 countires sent their aid to America. The americans successfully defended themselves from complete extinction with the power of the armed communities. Just as the calm comes nearer, something unexpected happens. Big metal shells drop from the sky, slamming into the ground of infested areas. After impact, they unveiled a green material, emitting a new type of radiation not thought possible on this planet. A radiation with a special code, rewriting infected DNA and turning the re-animated into more advanced biological warmachines. The little, isolated cities that remained, didn't stand a chance to the new kind of infection. It could even combine creatures into larger beings that didn't need any food but one, the flesh of the living. Ordinary groups of ordinary people could become a 20-feet tall killing machine, completely totalling the remaining refuges.

Gameplay
The players play as civilians, trapped inside the town they used to call home. The group acting as one, has built a minor base with junk and debris, but it won't stay up long with that kind of defense. The players must dive into the undead world to acquire food, water, supplies and citizens to work for them. Failing any of these will result in tough consequenses. They will find citizens that will aid the players in their build and defense, but they won't do much more. The players will still have to get the remaining things.