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Trivia
Uniquely, the jar of venom is intentionally made as an untradeable drop, unlike all the other boss jars that came before it. This is because the Old School Team considered boss jars overall to be in a position of being a rare "flex" cosmetic that can be traded between players, and wished to try having the jar of venom be more exclusive.
The jar can be shown to Weave in the Morytania Spider Cave, who will remark that she finds the jar fascinating, but now she need something more potent to progress her research.