Whenever a monster tries to read a scroll of teleportation and level teleports to the current level (“foo shudders for a moment”), you are prompted to call the scroll.

The scroll of teleportation now levelports when blessed and limits your possible teleport destinations to a small radius when cursed. Confused teleport gives you a single controlled horizontal teleport.

A blessed scroll of teleportation will allow you to follow monsters that recently teleported away, whether that is a levelport or a normal horizontal teleport.