At the end of their turn, Goblins may place Bombs in adjacent Regions that are occupied by opponents’ Active Races.
When you first pick the Goblins Race, shuffle the 12 Bomb tokens and place the stack facedown next to you.
If you place bombs in adjacent opponents’ Regions, pick the tokens from the top of the stack and place them facedown (never more than one Bomb token per Region) without looking at them.
At the beginning of your next turn, if the Region with a Bomb token is still occupied by an opponent (and even if the Race has gone In Decline in the meantime), reveal the Bomb token: an explosion is treated as a successful conquest (the opponent loses 1 Race token, retrieves all others for redeployment as usual) except the Region is now empty. A miss has no effect.
In either case, the Bomb token is discarded to the box.
If the Region is emptied before your next turn, put the Bomb token back on top of the stack without looking at it. When the Goblins go In Decline, the Bomb tokens that were placed at the end of their previous turn are revealed and their effect is applied normally. If the Bomb tokens stack is depleted, Goblins can no longer place Bombs on the boards.