You are in Hazarmaveth Town, where an ancient temple could lead you to relevant information about a Dragon that could be living in (and expanding) the Wasteland. The poor town was the site of ungodly experiments in necromancy, and as a result, its populace has turned into living-flesh-eating zombies that recently attacked Ironhand troops that marched by a nearby road.
Rush to unlock the doors to the center of the temple (which is also the center of town) and execute a ritual that will decimate all zombies at once. The ritual takes a while, and zombies are coming after you, so you must find the perfect balance between taking your time to kill all zombies and running past them, which could result in an accumulation of undead that out-strengthens your resistance.