About 600 years after the volcano that created the crater blew. a small long astroid smashed into a place that was once the drop-off between the grassy plateaus and grand reef. it upon impact, it caused a shockwave that went somewhat upwards due to its length, thus creating the small dent with strange formations that we nowdays call the sparse reef, i think this explains why the sparse reef is so small. and so sparse. although there probably wasn't much life at the time it hit.
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