Day 7 – What was your most impactful RPG session?
I'm not really sure what is meant by this question, but...
Two game sessions come to mind, depending on how one interprets the question. The first was a game session of the old Universe SF RPG from the folks at SPI. The player characters knew that there were alien shape-shifters infiltrating the facility that they were at, and when one of the player characters was mortally injured by the one masquerading as the doctor, the other player characters took her to the doctor's medlab for treatment. The dying player character knew full well that the doctor was the shape-shifter, and was afraid he would kill her, but couldn't tell the other characters about this due to her condition. Sure enough, the shape-shifter killed her when the others left to find the shape-shifter. A truly emotional scene.
The second session was my very first running of the Primeval RPG, in which a group of characters encountered their first prehistoric creature - a T. rex! The scene was an action-packed session from start to finish, with the player characters running from the creature whih doggedly pursued them. They ran smack into a pack of large herbivores, and spent the rest of the game session leading the T. rex away from the Scutasauruses and their infants, eventually getting the dinosaur to fall into a ravine after it teetered on the edge for some time. Pure adrenalin and the rush of it all for an entire game session. Loved it.