Amulet that revives it's wearer when they are brought to zero, before which it explodes in a fiery hellstorm. Phoenix Down.
Magical artifact that can contain one willing creature and keep them alive until they're brought back out again, would be useful for mounts.
Magical tattoo that can do Misty Step 1/day or produce thieves' tools 1/day.
Spell or charm that can create mundane darkness, not magical darkness.
A mechanical or magical explosive that ignites when exposed to air after a set period of time.
Spell or charm that accomplishes minor alchemy.
A juvenile mimic.