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The sussurus appeared in second edition Advanced Dungeons & Dragons in the Monstrous Compendium Fiend Folio Appendix (1992).
The sussurus appeared in third edition in Monster Manual III (2004), where it is spelled "susurrus."
A sussurus is a creature covered in bamboo tubes, and when it breathes through these reedy tubes it creates its eerie "dronesong" that causes other creatures to fall asleep.
In third edition, the monster is instead made out of glass save for holes that perform the same function.