# Teleport control
Teleport control is a property that complements teleportation. You can choose the destination whenever you teleport.

Contents

1 When it works
2 When it doesn't work
3 Acquiring
4 Controlled level teleport
5 Messages
6 SLASH'EM
7 dNethack
8 References

When it works
Teleport control works, regardless of whether it is an intralevel teleport or levelport, and regardless what caused you to teleport (teleportitis, wand, scroll, trap, quantum mechanic attack, or throne effect).
Teleport control also allows you to attempt to teleport to escape drowning if you have teleportitis or are a teleporting monster.

When it doesn't work
If you are stunned or unconscious, you will be unable to control your intra-level teleports. [1] If you are stunned you will be unable to control your levelports.  If you are confused your levelports may take you to a random level instead of the one you pick ("Oops..."); this chance is dependent on your luck (rnl(5)).[2]
If you select a region of the screen you cannot occupy (inside stone), or a square with a trap or boulder or already occupied by a monster, you will instead be sent to a random point in the level with the message "Sorry...".[3]

Acquiring
Teleport control can be acquired extrinsically by:

wearing a ring of teleport control
carrying the Master Key of Thievery
or intrinsically by:

reaching experience level 17 as a wizard or monk
polymorphing into a tengu
eating a tengu (17%) or the Wizard of Yendor (25%).
eating a ring of teleport control
Controlled level teleport
If you try to levelport to too deep a level—if you say "99", for instance—you will be sent to the lowest possible level from your current position, which generally means the bottom of your current dungeon branch. A controlled levelport from anywhere in the Dungeons of Doom cannot take you deeper than the Valley of the Dead; a controlled levelport from anywhere in Gehennom can take you only as deep as the vibrating square level until you perform the invocation ritual.
If you try to levelport to too shallow a level, you will be sent to the parent dungeon branch. For example, the same level 1 is reachable from the Dungeons of Doom, Gehennom, the Gnomish Mines, and Vlad's Tower. In the Quest, levels are counted relative to the quest branch. In other words, you should use the number displayed on the bottom line (like "Home 1") instead of the depth displayed on restoring ("You return to level 16 in the Quest"). You cannot levelport out of the Quest, and you cannot levelport in Fort Ludios at all, except to negative-number "levels" (0 is suicide, −1 to −8 are in the sky, and −9 and beyond are heaven).[4]

Messages
You feel controlled!
You gained teleport control by reaching XL 17 as a Wizard or Monk.
You feel uncontrolled!
You lost teleport control through level drain.
You feel in control of yourself.
You gained teleport control from eating a corpse.
You feel centered in your personal space.
As above while hallucinating.
SLASH'EM
In SLASH'EM, it can also be acquired intrinsically by:

eating the corpse of a giant shoggoth(20%).
extrinsically by:

carrying the Candle of Eternal Flame
carrying the Storm Whistle
dNethack
In dNethack, it can be obtained by eating the corpse of a phase spider. (unknown chance)

References

↑ teleport.c in NetHack 3.4.3, line 421

↑ teleport.c in NetHack 3.4.3, line 606

↑ teleport.c, line 444, teleok in teleport.c

↑ teleport.c#line662

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