Sleep Arrows

The purple sleep arrows are specifically made by the ranger Tseramed in  Ultima VII. Besides a modest increase in damage, the tip is made from the stingers of giant bees, giving the  arrow the ability to put the target to sleep. Despite this useful effect however, they are rare, since only Tseramed makes them.

Tsermed gave the Avatar some for free in Ultima VII.

In  Ultima VII Part Two, sleep arrows are created by applying king's savior to any plain arrows. This will create an arrow that is capable of putting any creature to sleep, and is specifically needed to kill Draygan.

Trivia

 * Tseramed's Arrows add +1 to the weapon's basic damage.
 * They only appear in Ultima VII.