Bombarossa is an enemy that appears in Four Swords and The Minish Cap. If Link touches this explosive creature, it will immediately blow up, causing damage to its surrounding area. Any Bombarossas around it will also explode, sometimes creating a domino effect. In Four Swords, Bombarossas will also reappear after some time; they always follow a set path.
Bombarossa sprite from The Minish Cap