Arcane eye

Wizard eye is a wizard spell that creates an invisible "eye" about 1 in (2.5 cm) in diameter that can provide the caster with visual information. The eye can see up to 10 ft (3 m) with infravision and otherwise can see normally. It can move at about 30 ft (10 m) per minute and cannot pass through physical objects.

Although the eye cannot be used unless the caster is actively concentrating, a break in concentration merely disables the eye, and does not end the spell, as concentration can be resumed later. The spell is effective even if the caster is blind or in an area of magical darkness, as long as the eye itself is not.

The material component is a piece of bat fur.