Hofmaimaierall is rotten
CombatWombatAs a boring killjoy D&D rules lawyer, I might point out that this will definitely lead to “them” winning, since you are killed when you attune, and therefore can never deal the 1d8 bludgeoning + 30d12 radiant damage.
The effect is not instant, you only day days later. Short term (like a fight) there is no change.
Mmm this is a good interpretation. You get radiation poisoning and only die later. If for whatever reason, this item appeared at my table and we needed to adjudicate this, I would totally accept this reading.