Now, in Spiral Knights, fighting your way through a set of boss levels will normally give you three boss tokens as a reward for your hard work. However, occasionally the system will decide to be generous and give you 4 tokens instead. Considering running boss levels isn't exactly a quick thing, I'd like to obtain this 4-token reward as much as possible, except I can't figure out what triggers it. So, does anyone have any idea how to ensure you gain 4 tokens from the boss level?
Things I know do NOT determine it:
1)Running the boss solo (I do this all the time)
2)Completing the entire level set without dying (I've done this and not gotten 4 tokens, and the last time I got 4 tokens I had to revive once.)
3)Doing the boss levels via the clockworks rather than the mission screen (As far as I can tell, it makes no difference, aside from the initial 1-token bonus you get when you clear the relative mission for the first time.)