The bombs can be detonated in a Dominion tower battle to damage one enemy for 1/10th of their current life points. There is a chance that they will miss. A few seconds after the initial hit, four explosions will appear around the area where you detonated the bomb, hitting enemies for additional damage if they are nearby. Only four bombs may be used per match in Dominion Tower. When they hit, diminutive bombs always cause damage, even on enemies which you shouldn't be able to damage (e.g. Dagannoth mother, or Delrith without Silverlight or Darklight).