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Demon Core flail
18 blunt damage 65 radiant damage over time No saving throw
18 blunt, 65 radiant damage, 6 constitution damage, continuous 1 constitution damage per day.
Eh 65 is survivable. We're looking at more like 650.
The folks exposed died a few days after. So it wasn't instant. Very slow and horrible probably as all their organs and cells died at a molecular level and skin fell off.
So damage over time and can not be healed. Would be accurate.
Slotin knew he fucked up as soon as it happened too. Apparently, he would always use a screwdriver to hold the thing open and was warned multiple times he was gonna kill himself. He did use himself as a human shield, though (not sure if it was deliberate or just happenstance), and ended up being the only fatality in that incident, iirc.
In fairness, several others in the room died years-to-decades later of leukemias that were arguably attributable to their exposures. That said, the Slotin criticality accident is one of those cases where nuclear disasters end up being both completely horrifying and a lot less deadly than you think they ought to be.
So about 1d8 con damage instantly then 1d2 con daily.
1d65 radiant damage per day in perpetuity