Mr. Boom is an activated item.
- Places a large bomb similar to ones produced by Mr. Mega.
- Despite slightly different appearance, the bomb is functionally identical to a Mr. Mega bomb, being compatible with all bomb modifiers.
- This item can drop from Wrath.
- Book of Virtues: Spawns wisps in the middle ring, looking like bombs. The wisps spawn miniature homing bombs when destroyed. These miniature bombs behave the same as ones created by Scatter Bombs, with the exception that they deal 100 blast damage instead of 50.
- Mr. Mega: No further improvement in damage or blast radius.
- When used, the sprite of Mr. Boom appears to have a missing tooth, but the pedestal sprite and official artwork from Four Souls shows it has a perfect set of teeth.
PS4 WVZ9 BE6A (First floor treasure room)
PC KHC7 MX6T (Treasure room adjacent to spawn)
Switch Z2RR 409N (Treasure room adjacent to spawn, also contains the D7)
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