Accumulates experience as you do. When fully charged it produces 40 Big Bombs. This effect can only trigger once a week.
The Pyrotechnics Papers is a Legendary Tome that can be bought from the Store for 2500 Credits. They produce 40 Big Bombs, when they are fully charged. Unlike Common Tomes (that can be used as often as you like without cooldowns), these tomes can only be used once a week, although, they provide more rewards than Common Tomes per individual use.