Sorry to double post, but I'd like to remind all members, new and old, that one of the server rules is:
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Fill in your Creeper holes near inhabited areas (if you're far away and not near other people's creations it's not important).
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There are a lot of craters around the Great Delving. If it's dark and you need to move around then sleep and ask other players to go afk, or wait until day comes. Sleeping as soon as night falls (when practical) also limits mob spawning a lot. But if you do make a crater, fill it in as soon as you know you're safe (creepers, like most mobs, often spawn in packs, so be careful).