Teleport control

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The teleport control intrinsic allows you to choose your destination when teleporting. The control is not completely precise: there can be a deviation of up to 2 squares. If this would land you in a wall or a monster, you get a random teleport instead. Additionally, Blinking with teleport control allows you to choose the general direction of your blink. The level 7 spell Controlled Blink contains built-in teleport control.

Controlled teleportation can be hazardous if overused, accumulating significant amounts of glow with each attempt. Try not to use it more than twice in a row to avoid unpleasant consequences.

There are three methods of obtaining teleport control: wearing a ring of teleport control, casting the level 4 spell Control Teleport, or having the Teleport Control mutation.

Derivation

A controlled teleport will usually send you to a square you select or one of the 8 neighboring squares, but there is a 25% chance of your destination being one tile away from wherever you should otherwise land. This means that you may land anywhere in a 5×5 grid around your target tile. If your final destination is occupied and thus unsuitable for teleportation, you'll get a random teleport instead.

Assuming that all squares are valid teleport positions, the odds of each possible landing site are listed below (the middle of the table is the targeted square):

0.3%	0.6%	0.9%	0.6%	0.3%
0.6%	9.6%	10%	9.6%	0.6%
0.9%	10%	11%	10%	0.9%
0.6%	9.6%	10%	9.6%	0.6%
0.3%	0.6%	0.9%	0.6%	0.3%

Exceptions

Berserk

Berserk characters are incapable of the mental focus necessary for a controlled teleport, so all their teleports will be random.

-cTele

Teleport control is not allowed on some levels until certain conditions are satisfied. The message, "You sense a powerful magical force warping space," will appear as soon as you arrive on these levels, and you'll see the "-cTele" flag in your status display. Attempting to teleport anyway will simply generate a random teleport instead.

• Labyrinths - Controlled teleports are disabled in Labyrinths. Furthermore, all teleports within a labyrinth will move you away from the center, never toward it.
• Elven Halls:3 - Controlled teleports are disabled on Elven Halls:3.
• The Slime Pits:6 - Controlled teleports are disabled on Slime Pits:6 until you have killed the royal jelly. Note that you'll need teleport control (or a means of digging) to get to the treasure and rune on this level.
• The Abyss - Controlled teleporting is always disabled in the Abyss. Additionally, it may take longer than usual for a random teleport to kick in (message: "You have a feeling this translocation may take a while to kick in..."). Teleporting in the Abyss has a 20% chance of generating a new Abyss level.
• The Tomb - Controlled teleports are disabled in this branch until you have obtained the golden rune.
• The Iron City of Dis:7, Tartarus:7, Gehenna:7, Cocytus:7 - Controlled teleports are disabled on the last floor of each Hell subbranch until you've acquired the rune.
• Ziggurat - Controlled teleports are disabled on floors 25-27. Floors 7-24 have the possibility of being disabled.
• The Realm of Zot:5 - Controlled teleports are disabled on level 5 of the Realm of Zot. Once you have acquired the Orb of Zot, controlled teleports are permanently disabled for the rest of the game.