Well if we're talking about "weird things about powerful AD&D magic items", here's a fun one:
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The logic behind the charge costs is puzzling. At first, you think "well, the closer a class is to being considered "good", the easier it is to raise them. No wait, Clerics can be evil! Ok, so the closer a class is to the gods, I guess, the easier it is to raise them? So why is it harder to raise a Monk than a Bard?".
(EDIT: and then I remember 1e Bards are also Thieves, so why is it now easier to raise them from the dead than a Thief?)