When someone deposits four charges in a generator, the boss, Vosik, the Archpriest, will enter the field.
You will respawn quickly, however, after 5 seconds or until someone else revives you. Upon picking up a charge, you will have 15 seconds to find and pick up another for a maximum of four, otherwise you will die instantly when the timer runs out after 15 seconds.
These are voltage charges, which you need to accumulate and deposit in one of the generators, of which there are three - one directly ahead of where you start, and two further back to the left and right. Almost immediately, you should notice a number of white pillars of energy jutting up from the ground. You will spawn outside the giant transport sphere that serves as a gateway into the lair of the Devil Splicers.