I could not protect the entire coliseum. The temple is only so safe because my power has imbued it for many years, and I could not do the same thing for the coliseum. However, if you were to build a shrine of some kind within the coliseum, I could focus my energy on it when new arrivals come. It would not cover much area, but it would keep the monsters outside of it and provide a bit of safety. With Sorrow providing more food, I don't think it would be more of a drain on my resources than I can handle, but I would require some kind of focal point - both for my convenience and yours. That way you will know where to direct people to.
And yes, if you create a 'guidebook' I could add it to each phone, including the ones received upon arrival.
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And yes, if you create a 'guidebook' I could add it to each phone, including the ones received upon arrival.