Orb of destruction
|orb of destruction
|Will not be used by monsters.
Applying an orb of destruction simply causes it to explode, destroying the orb and dealing 12d6 damage. The damage is of the same type as that of magic missiles, and thus can be completely negated by magic resistance. Whether the orb is charged or not does not seem to have any impact on its effect.
All non-crystal ball glass orbs have a base price of 750 zm and weigh 75 aum, making it somewhat easier to tell an actual crystal ball apart from the other magical orbs (outside of NetHack brass, where the crystal ball also weighs 75 aum). Beyond this, the three non-crystal ball orbs can be distinguished by identification or use-testing - this is risky, since you may end up activating this orb.