Doublezap

Version 0.30: 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.

The following spells can bounce from most walls, allowing the ability to double-zap:

• Shock
• Lightning Bolt
• Electrical Bolt
• Crystal Bolt

Of these spells, only Shock can be cast by players.

In addition, crystal walls can reflect beams of cold and fire.

Common doublezap patterns

These apply for range 8 Shock.

For other spells, remember that hitting a monster is free, but bouncing off a wall costs two units of range (i.e. the wall counts as two squares). A creature next to the wall is, however, still affected twice, if (at least) one unit of range is left before starting 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

• Prior to 0.30, Lightning Bolt could be cast by players, one of the only two common ways to doublezap enemies.
• It used to be possible to triplezap and even quadrizap, but zapping was limited to twice in some earlier version of the game.