Bomb

Bomb is an item which have a chance to drop after successfully defending an Item Island.

The Bomb can be given to your commanders in order to give them the ability to throw a bomb in battle (Throw range: 1 to 2 fields). Level 1 Bomb gives your commander one bomb to throw per island, after being upgraded to level 2 (8 coins) the commander gains a second bomb to throw per island. At level 3 (14 coins) bombs becomes a more powerful weapon gaining more knockback and a slightly larger explosion. This upgrade can be useful to more consistently decimate large groups of enemies. Be careful when using it, the bomb's explosion can harm your own units too!

As with every item in the game, once it is assigned to a commander, it cannot be removed anymore.You can choose Bomb as a starting item once you have unlocked it.

Recommended

 * Suitable for all three unit classes.

Pro over Warhammer

 * Does direct damage and will outright kill and stun enemies for longer amounts of time than the warhammer can.
 * Knockback can knock enemies into water
 * Higher range and can be used on varying inclines

Cons over Warhammer

 * Has a medium travel time making it a less flexible item, and one that needs planning and timing accounted for, whereas warhammer can be used very quickly.
 * Has limited uses
 * Knockback is less than Warhammer

Link
*Source: http://badnorth.wikidot.com/bomb