For each Damage Counter a player adds to a Villain, they draw a Bonus Token. Bonus Tokens have a variety of effects, and may be used on ANY player’s turn, meaning players can assist one another in their efforts!
Most Bonus Tokens represent (A) a Power Dice symbol, which can be used to assign to a card, for recruiting Heroes and attacking Villains (in addition to assigning dice).
Other Bonus Tokens (B) let a player roll an extra Power Die or (C) remove counters, as stated on the tokens.
Bonus Tokens can be used at any point on any player’s turn after rolling and resolving the Infinity Stone and Thanos Dice.
A player can wait until after rolling and assigning Power Dice before deciding if and how to use tokens. Once used and effects resolved, Bonus Tokens are discarded.