Presumably used by Jagex for analytics to analyze how many players visited the Soul Wars demonstration (and how long it took players to finish it) for data comparison. The player's eligiblity to join Soul Wars teams and games is determined by RS:Varbit/3804. No other known effect.
Values
0 when the player has not entered the Soul Wars demonstration (tutorial) before.
1 when the player has entered the Soul Wars demonstration (tutorial) for the first time.
