Players will run across Sydney while on the quest "Stealing Independence" and can elect to help her retrieve the Declaration of Independence from deep within the National Archives.
Sydney's 10mm "Ultra" SMG
If you successfully retrieve the Declaration of Independence and elect to split the reward with Sydney, you can meet up later in the Underworld
, where she stays as a vendor. If you give her a special note, you will receive the gun as a reward. Player could also kill her at any given time to get the gun as well.
Her name suggests that she is a refference to Sydney Fox from the TV show Relic Hunter