Only one Bonus Power may be active at a time, but players can purchase and try a new one any time they want as long as they have enough rare resources to do so.
These powers can be accessed and purchased from the Research Terminal in the Tech Lab aboard the Normandy, where Mordin Solus is usually found.
To unlock these, players will need to earn an Achievement, usually by completing a certain squadmate's loyalty mission. In Mass Effect 2, players can obtain a Bonus Power based on one of their squadmates' abilities. Sometimes, though, there will be an especially useful power from a companion or class that players want access to for Shepard. Related: How to Hack Datapads & Computers in Mass Effect 2 Each of these classes comes with a possible specialization in Mass Effect and Mass Effect 2, and all of them include a set of powers to choose from when players build their Commander. Otherwise, they can choose Vanguard for Biotics and Combat, Sentinel for Tech and Biotics, and Infiltrator for Tech and Combat.
Players can choose from Adept, Soldier, or Engineer if they want to be a pure Biotic, Combat, or Tech specialist, respectively. Each class allows Shepard to be a specialist in Biotics, Combat, Tech, or some combination of two of these.
Across the entire Mass Effect trilogy, players will have the opportunity to select a class for their Commander Shepard from the six available options.
