Anchor Rod

Rod
When button pressed: rod becomes fixed in space (cannot be moved by force less than 8,000 pounds). Button again releases it. Supports tremendous weight. Permanent. Iron rod with button. Resists up to 5,000 lb force. Greater force makes it drift 1 inch per minute and must be re-armed each minute.

Arcanist's Rod

Weapon
Bonus: +2.
+2 to hit and damage. Permanent. Two-handed staff carved with runes. Can be used as arcane focus.

Barbed Arrows

Ammunition
On hit: target takes 1 damage at start of their turn until they use action to remove (Tough save). 1d4 arrows. Cruelly barbed arrowheads. Painful to remove.

Boots of Soft Step

Boots
Footsteps make no sound on any surface. +2 to checks involving moving silently. Permanent. Leather boots with impossibly quiet soles that absorb sound of any material you walk on. Anything carried can still make a sound.