I was soooo looking forward to this when I saw it in the game's Features: "Recruit helpers such as the Solider"
Could the Solider make things Solid that weren't Solid already, perhaps a unique way to solve in-universe puzzles? Could the Solider do people "A Solid" so they would owe him favors in return?
No, they don't.
It's just a typo for Soldier...