When multiple people are casting on a single player with energy bolt, explosion, or flamestrike, there is a progressive chance that their spell will fail for a 1 second window. Each time a player casts an additional one of these spells within the window the window duration will be reset and a cumulative 12.5% chance to fizzle will be added. After 1 second passes that the player has not been casted on the chance will return to 0. The first cast on a player will always have a 0% chance to fizzle from this mechanic.
When a player fizzles their spell due to this mechanic they will receive a message saying “Your spell's target is overwhelmed by magic and fails!”