Outside the walls there is a draining effect, very similar to the conditions in the unopened districts within the city. The effect isn't as concentrated, however, so it is possible to explore outside with help. But it's critical for anyone going outside the city to maintain physical contact with another person, or else the draining effect will set in very quickly.
Some of our readings also indicate that there are likely monsters outside the city as well, so anyone who can't fight will need help from those who can.
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Some of our readings also indicate that there are likely monsters outside the city as well, so anyone who can't fight will need help from those who can.