Summary
Due to the variety of advantages that a player can get in a game ofCivilization 6, other players will be required to have options to lower the advantages of the other civilizations in the game to achieve victory. These options can be in the form of direct warfare, diplomatic action, or espionage.
By using spies to their fullest, a player can utilize Espionage to cause various disruptions to other civilizations and also gain resources and advantages in the process. These spies are also able to take certain promotions to ensure successful missions.

7Linguist
Quickly Finish Missions To Ensure Disruptions
During the late-game stages ofCivilization 6, when every turn matters, completing espionage missions becomes a luxury as it can turn the tide for a losing civilization to gain the pole position in the game. Some missions, such as Breach Dam to cause a flood andstop a city from growing, are quite disruptive.
A Spy having the Linguist promotion will be able to swiftly execute these missions with ease. When paired with other promotions, a Master Spy can execute a mission reliably and swiftly without giving the targeted civilization any chance to retaliate.

6Polygraph
Increase The Likelihood Of Catching Enemy Spies In The Act
Espionage ultimately goes both ways, as the enemy civilizations will be able to infiltrate a city and place a spy as well to disrupt a player’s chance of winning the game, such as viathe difficult Culture Victory. Therefore, the player needs to have a spy of their own guarding important districts in their city, especially the capital.
Having the Polygraph promotion for the guarding Spy will be quite beneficial as it hinders enemy spies from operating effectively. This will also allow them to be captured more often, making it a powerful promotion to have.

5Demolitions
Win The Wonder Race Handily By Sabotaging Production
Due to its scarcity, building much coveted World Wonders such as the Statue of Liberty and Ruhr Valley can be tricky as there will be multiple players who are vying to acquire them. Thosepowerful World Wondersalso typically require a lot of production to be built.
However, with the help of a Spy having the Demolitions promotion, building those World Wonders will be easy as the player can simply sabotage productions in the other civilizations' cities. It is important to know that identifying the city building the targeted Wonder is also crucial as well.

4Guerilla Leader
Weakens Other Civilizations For Incoming Invasion
Espionage is useful for all kinds of civilizations, even the ones that rely on warmongering efforts toachieve a Domination Victorydue to their unique militaristic bonuses. These kinds of civilizations can resort to every possible means to weaken their target civilization before an invasion to ensure a successful war.
Performing the “Recruit Partisans” mission is one of the means that can be done by them, and its success rate can be increased by a Spy with “Guerilla Leader” promotion. If done correctly, even the strongest and most well-defended capital is in danger of being invaded as it will be surrounded by partisans after the mission’s success.

3Con Artist
Build Up A Strong Economy While Weakening Others
A strong economy can be built up by either strong Commercial Districts, owning a chain ofhighly profitable luxury industries, or simply stealing from other civilizations. The heist can be done by a Spy in the form of “Siphon Funds” which can potentially give the stealing civilization a boost in economy.
Having a Spy with the “Con Artist” promotion will boost the chance of the mission’s success rate. If left encountered, a Master Spy with the promotion and a plethora of other promotions can single-handedly destroy a civilization’s economy while boosting their own.

2Rocket Scientist
Disrupt Attempts Of Science Victory In Late Game
During a late game session ofCivilization 6, it is not an uncommon sight to see some civilizations having a highly-guarded Spaceport to achieve a Science Victory. Thwarting such an attempt will commonly require drastic measures,such as nuclear strikes.
Alternatively, it can also be done covertly via the spy mission “Disrupt Rocketry,” which pillages the district and postpones any Science Victory project in the city. This can buy some precious time for the other civilization to either catch up or simply destroy the city via other nefarious means.

1Technologist
Obtain Advantage From More Technologically Superior Civilizations
Being left behind in a technology rush can be common, especially during an intense multiplayer session where all players will be maximizing their output to achieve victory, such asthe coveted Science Victory. Catching up to those technologically superior civilizations is easy with the help of the “Steal Tech Boost” mission by a Spy.
The mission’s success rate can be boosted further with the “Technologist” promotion, making it easier to obtain technology boosts to catch up with the tech leaders. Moreover, catching up technology-wise can also provide further advantages for the stealing civilization, as they can utilize their initial focus to overwhelm the technology-focused civilizations.
