Force of the Breaker (FOTB) is the first appearance of the Crystal Beasts, it also gives a boost to FIRE-Attribute and several other older Deck themes. It also includes a number of cards connected to Continuous Spells; the form taken by Crystal Beast monsters when they are destroyed as monsters.
Highly sought after cards include "Eradicator Epidemic Virus," "Raiza the Storm Monarch," "Warrior of Atlantis" and "Gravekeeper's Commandant."