Marshberry is an item in Tyranny.
The juice of the wild marshberry speeds up the imbiber's movement and reaction time. Found growing wild in the marshes of Stalwart, these berries are a potent drug. The merchant princes of the Bastard city were known to indulge in marshberries to sustain a night of drunken revelry. A lifetime of use can result in crippling joint pain and a dullness of wits. This consumable's effect increases in strength as its user gains in power.