The latest Dungeons patch broke the interaction between chain reaction and explosions. For all the following information I am refering to "explosions" in the form of exploding crossbows and firework arrows: In previous versions, chain reaction triggered once per shot explosion from both exploding crossbow explosions and firework arrow explosions. However the most recent patch broke this behavior, now chain reaction triggers separately for each mob hit by the explosion, which instantly kills everything and is far too powerful.