What was the "dumpling" mentioned in Grave Robber's Chronicles?

In Grave Robber's Chronicles, zongzi was a traditional Chinese food, usually made from glutinous rice, meat, red dates, and other ingredients. It was used as a sacrificial or holiday food. The shape of the rice dumpling was mostly round or triangular, but there were also long varieties. During the production process, dumplings often needed to be filled with some fillings such as egg yolk, bean paste, sweet filling, etc. In grave robbing operations, rice dumplings were often used as traps or obstacles to prevent grave robbers from entering. Because of its stickiness, rice dumplings were often used to stick traps or prevent escape. The dumplings in Grave Robber's Chronicles were described as a divine artifact with strong stickiness that could stick to anything that entered the dumplings.