The Boomerang does double the damage of the dice. However, damage is dealt back to the user at the same time, which can be fatal if the user doesn't have enough health.

The self-damage dealt by Boomerang still occurs if the enemy Dodges the attack.

Boomerang does not work with more than one count of Fury, uniquely. It can only activate at most twice.

If both fighters would be defeated by the Boomerang, the player is kept alive at 1 health. This occurs even if the player would be killed by the first Boomerang if Fury is active.

The Warrior's Welcome, Curse of Greed, Elimination Round (Warrior):

• Level 3 reward option
• Has a chance to appear in shops on floors 2 and 3.

Worse than a Curse:

• Has a chance to appear in shops on floors 2 and 3.

Bonus Round (Warrior):

• Possible starting equipment with Small Shield
• Possible level 3 reward option
• Has a chance to appear in shops on floors 2 and 3.

Enter the Inventor, Double Rubble, The Inevitability of Rust, Elimination Round (Inventor), Bonus Round (Inventor):

• Has a chance to show up in shops on floors 2, 3, and 5.

Expect the Unexpected:

• Has a chance to appear as the unexpected spell

Can be generated from the Lunasa equipment if playing as the Witch, and can also show up in the fourth slot if the Witch bonus round rule is active.

Not Just a Jester:

• Level 3 reward option