A guam vial is made by using a clean guam on the special vial after water is poured into it. It is the first step of creating the Waking Sleep Potion, necessary for accessing the Dream World in the Lunar Diplomacy quest. The second step is to use the guam vial with a clean marrentill to produce a guam-marr vial.
An alternative process is to create a marr vial first, and then add a guam to produce a guam-marr vial.
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