Block teleport may be cast within a room and it will attempt to prevent
any teleportation into and out of the room. Block teleport spell cast
upon an already blocked room reinforces and makes stronger the warding
against ethereal intruders. With time, the degree of protection from
teleporting weakens until it fades out.
Trace teleport may be cast within a room and it will inform the caster of
where the last teleportation within it have lead to. In addition, trace
teleport will inform the caster on the warding a room has against teleports.