Gotham Zoo Hanging Rail - Serum

 is a rare base item.

Obtained from

 * Riddled with Crime: Base Item Box (random)
 * Riddled with Crime: Large Base Item Box (random)
 * Riddled with Crime: Loot Cache

World Appearance

 * Gotham City Zoo

Feats

 * Comedy Club: Collect 10 contraband Base Items from Riddled With Crime (10 points)
 * Comic Stand: Collect 1 contraband Base Items from Riddled With Crime (10 points)
 * Enig-mansion: Collect 30 contraband Base Items from Riddled With Crime (25 points)