The bomb appears as a black metallic sphere, 12 inches in diameter and weighing 10 pounds, ingraved with silver arcane glyphs. You must spend ten minutes tracing the glyphs to arm it. One minute later the bomb will detonate, creating the following effects: 

• Creatures within a 60-foot radius automatically take 20d8 +150 force damage. A creature reduced to 0 hit points by this damage is disintegrated. A disintegrated creature and everything it is wearing and carrying, except magic items, are reduced to a pile of fine gray dust.
• Creatures within 60 feet of the initial blast radius must make a DC 20 Constitution saving throw or take 20d8 + 50 radiant damage, or half as mich damage on a success.
• Nonmagical objects and structures within a 120-foot radius are disintegrated.
• The area within a 60-foot radius becomes a permanent antimagic field.
• All nonmagical plant life within a 300-foot radius wither and die.
• For the next 1d100 days, a creature that starts its turn within the created antimagic field takes 20 radiant damage and gains a level of exhaustion.

A creature can try to disarm the bomb before it detonates by casting dispel magic on it (DC 20). A dispel magic cast at 9th-level succeeds automatically.

Notes: Damage: Force, Damage: Radiant, Damage, Consumable