- Geth Sappers, like all Geth Hoppers, are lightweight and lightly armored, making them vulnerable to gunfire. The problem is getting them to hold still long enough for a clear shot. Happily, they are usually encountered indoors, and a Hopper usually leaps back and forth between two positions across a room, allowing you to hit them on their return jump.
- Physics-based biotic attacks, especially Throw, will inflict heavy damage against Stalkers. Lift works nicely to hold them in midair, especially if you're using a sniper rifle.