Spoiler: Why Items are on this List

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The +X armors and shields, dwarven plate, defender, staff of power and robe of the archmagi all allow the user to boost their AC out of the range of bounded accuracy. Enough AC and a character becomes functionally immune to low level checks on their ability to run rampant, like the town guard or small armies. This sort of thing is possible using items not on this list, but it requires significantly more investment in terms of the player's attunement slots. Characters eventually growing up to the point where they don't care about low level NPCs isn't a bad thing, but it doesn't fit all campaigns.



The armor of invulnerability is on this list for about the same reason.



All items that grant either flying or a flying mount are on the list for a similar reason, though they obsolete enemies without flying or a strong ranged attack rather than low level nonmagical enemies.



The Cloak of invisibility likewise obsoletes enemies that can't see invisible things.



The Helm of Teleportation, Amulet of Planes and Cubic Gate are here because they essentially obsolete any quest involving travel times, and in the later cases many quests involving things being on another plane. Additionally, they give an almost absurdly strong panic button to the holder.



Sending Stones and the Crystal ball are here because of their impact on the world, both massively change the rate of travel of information, and the latter doubles as an extremely potent knowledge gathering tool in PC hands, which bears looking into for that reason alone.



The Alchemy Jug, Decanter of Endless Water, Sphere of Annihilation and Ring of Telekinesis are here for their massive effect on the economy. All three can potentially make a profit that dwarfs their listed price if used in a clever enough manner over a long timespan.



The Potion of Longevity are here for medical reasons which should be fairly clear.



Daern's Instant Fortress potentially has a huge impact on grand military strategy.