OMG, clockwork amulet is amazing. It's often very easy to calculate the monster's AC, and it's often low enough that a 10 hits, so this item amounts to "1/day, automatic hit." And it doesn't require attunement! Should probably be Rare, not Common.
Technically, since it doesn't require attunement, you could wear like 20 of them and just auto-hit all day long (although if a player of mine tried that I would explain that "rocks fall, you die" is also technically allowed).
More good ones:
- The pot of awakening has some utility for guarding your base. Combine it with a staff of flowers and protect your castle with wall of sentient rosebushes!
- The rube of the war mage is super-sweet for any sort of spellcaster who also wants to use weapons. At higher levels its utility drops off because of the attunement requirement.
- The bead of nourishment and the bead of refreshment don't say how much they weigh, but assuming they are MUCH lighter than normal rations, it would be good to have a few on hand as "emergency rations" if you get lost in the wilds or stuck on another plane of existence or something.