I couldn't miss the chance to practice my drawing!
Bust is a negative status effect in Final Fantasy XI which exclusively afflicts Corsairs. When a Corsair uses his/her Phantom Roll ability and then uses Double-Up one or more times and ends up with a number greater than 11, s/he will receive this status ailment. The status ailment gives a moderate negative effect of the same type that would have been granted should the Corsair have gained a positive relative to the type of roll attempted. The penalty is not given to all of the party, as the bonus would have been, only the Corsair. For example, if the Corsair rolls a bust while doing Chaos Roll, which would normally give him/her an Attack bonus, s/he will receive a penalty to his/her Attack score.