It was my understanding that each blu I’m a party has their own rng chance of earning a spell, but if one earns it everyone earns it. So say the spell has a 10% drop rate and you have a 4 blu party, each person has an individual 10% chance of getting the drop, but since you’re in a party you then get 4 10% “rolls”. Each kill gets you 4 chances (in a 4 blu party) which does increase your odds of getting the drop over being alone.