Spoiler: OOC
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Make a Persuasion check. Meekly has Helped you for advantage on the roll.
On a 13 or less, they'll be quite panicky.
On a 14-19, they'll be alarmed, but up until actual danger shows up, they'll keep it together.
On a 20+, they can even keep their cool if danger is handled quickly.
There's a moment of silence. No one so much as breathes. The silence is broken, though, by someone asking "How long do we have?"
Meekly answers, saying "We don't know for sure, so please, pack quickly and safely. Leave non-essentials behind. Your survival is more important than any random knick-knacks." The villagers begin moving out, quickly, and while some people are breathing heavily, others are talking to them, keeping them calm. You can hear some children crying as the reality settles in, but everyone seems to keep their heads about them, overall. When the temple is mostly empty, Meekly breathes a sigh of relief. "That... That went better than I could've hoped. If you'll excuse me, I've some packing of my own to do."