Doublezap

Version 0.17: This article may not be up to date for the latest stable release of Crawl.

Doublezap is the ability to hit a monster twice with a single casting of a spell. Most of the time, only two spells can be used this way, both electrical: shock and lightning bolt (including the bolt from a wand of lightning). Beams of cold or fire can also be used for doublezapping, if you find green crystal walls.

Doublezaps cannot be done in areas with metal walls, as the electricity becomes "grounded" after striking the first wall.

Common doublezap patterns

These apply for range 8 Shock. For lightning bolt, extend those remembering that hitting a monster and continuing is free. but and bouncing off a wall costs two unit of range (i.e. the wall counts for two squares). A monster next to the wall is however still affected even if range is exceeded, as long as one range unit is left when hitting the monster before the bounce.

Bounce back, monster next to wall

Bizap and hit yourself:
@.M# <-- shoot at monster with the '!' key

Bizap:
@..M# <-- shoot at monster with the '!' key

... up to ...

Bizap:
@......M# <-- shoot at monster with the '!' key

Monozap:
@.......M <-- shoot at monster

Bizap:
## <-- shoot at this wall with the '!' key
...
M.@
##

Bounce back, monster one square from wall

Bizap and hit yourself:
@M.# <-- shoot at monster with the '!' key

Bizap:
@.M.# <-- shoot at monster with the '!' key

Bizap:
@..M.# <-- shoot at monster with the '!' key

Monozap:
@...M.# <-- shoot at monster with the '!' key

Bounce back, monster two squares from wall

Bizap:
@M..# <-- shoot at monster with the '!' key

Monozap:
@.M..# <-- shoot at monster

Corner bounce, monster next to wall

Also works with a concave corner:

M#
##

Bizap and hit yourself:
@
 .
  M. <-- shoot at monster with the '!' key
  .#

Bizap:
@
 .
  .
   M.  <-- shoot at monster with the '!' key
   .#

...

Bizap:
@
 . <-- shoot at empty square with the '!' key
  .
   .
    .
     .
      .
       M.
       .#

Monozap:
@
 . <-- shoot at empty square with the '!' key
  .
   .
    .
     .
      .
       .
        M

Corner bounce, monster one square from wall

Also works with a concave corner:

M#
##

Bizap and hit yourself:
@
 M <-- shoot at monster with the '!' key
  ..
  .#

Bizap:
@
 .
  M <-- shoot at monster with the '!' key
   ..
   .# 

Bizap:
@
 .
  .
   M <-- shoot at monster with the '!' key
    ..
    .#

Monozap:
@
 .
  .
   .
    M <-- shoot at monster with the '!' key
     ..
     .#

Corner bounce, monster two squares from wall

Also works with a concave corner:

M#
##

Bizap:
@
 M <-- shoot at monster with the '!' key
  .
   ..
   .#

Monozap:
@
 .
  M
   .
    .
     # <-- shoot at monster

Offset by one, monster next to wall

Bizap:
@.
 M# <-- shoot at this wall with the '!' key

Bizap:
@..
  M# <-- shoot at this wall with the '!' key

Bizap:
@...
  .M# <-- shoot at this wall with the '!' key

Bizap:
@....
   .M# <-- shoot at this wall with the '!' key

Bizap:
@.....
     M# <-- shoot at this wall with the '!' key

Bizap:
@......
      M# <-- shoot at this wall with the '!' key

Bizap:
@.......
       M# <-- shoot at this wall with the '!' key

Monozap:
@.......
        M <-- shoot at monster

Offset by two, monster in a corridor

Bizap:
@.
#.# <-- shoot at this wall with the '!' key
#M#

History

It used to be possible to triplezap and even quadrizap, but zapping was limited to twice in some earlier version of the game.