TOPIC: Champion Set Bonus

I feel like the one thing missing from the recent years' volunteer tokens is a set bonus now that there are so many with Champion in the name.

Assuming that they will always have some combination of Base Stat(s) on the tokens themselves, the obvious base set power is +1 Level, but what else would be good? Free Movement? Crit Immunity Bypass on Monsters? It could be Tiered so 3 piece gives +1 Level, 4 piece adds Free Movement, 5 piece adds Crit Immunity Bypass, 6 piece adds Immunity to Psychic Blast, Possession, and Lost One Effect, 7 piece adds another +1 Level? (I am only half-joking about that last one)