Lee's Rapid Deconstruction

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Version 0.21: This article may not be up to date for the latest stable release of Crawl.
Lee's rapid deconstruction.png Lee's Rapid Deconstruction
Level 5
School1 Earth
Casting noise 4
Spell noise 20
Fragments a wall or a suitably brittle visible monster into an explosion of deadly shrapnel. It can be used on monsters made of ice, bone, or any wall-like substance, as well as those turned to stone by petrification. Its damage is strongly reduced by armour.

Targets made from rock, stone, ice or bone will cause a small explosion. Metal targets will cause a small but more damaging explosion, and targets made from crystal will cause a large and more damaging explosion.

At high power, this spell is capable of destroying some walls: rock, stone or metal walls have a chance of being destroyed with at least 5, 6 or 7 bars of power respectively. Crystal walls are particularly brittle and have a chance of being destroyed at any power level.

Spell Details
Damage Formula Nd(5+Power/5) (see damage formula)
Max Damage 4d45
Max Power 200
Range LOS
Targeting Smite
Special Explosion
Triple AC damage reduction
Can destroy walls

Lee's Rapid Deconstruction (or LRD) is a level 5 Earth Magic spell which causes walls and some monsters to explode into a cloud of shrapnel, tearing up nearby enemies and potentially destroying the targeted wall or monster. It has smite-targeting, and is exceptional in that it allows you to attack enemies hidden from your field of vision.

The Target

If the target is a creature, its potential susceptibility is dependent on its composition. Only hard or brittle creatures may be targeted directly. These include

While Dig only works on rock walls and transparent rock walls, LRD can destroy harder materials, although this method requires much more time and energy. Different materials require different minimum spell powers to be destroyed:

Material Min Spell Power Success Rate
Door (open, closed, secret) 0 100%
Iron grate, granite statue, orcish idol 0 100%
Green crystal 0 33%
Rock, transparent rock 35 33%
Stone, transparent stone 50 10%
Metal 75 5%

The chance to destroy a wall is fixed as long as you have the minimum spell power required to destroy a wall.


Assuming the target was a viable wall or Dungeon feature, the spell then causes an explosion of shrapnel against everything in its range (including yourself!). The range of this explosion varies based on target. Viable monsters hit by LRD will create a similar burst of shrapnel with range and damage determined by the monster's material.

This attack is similar to casting Sandblast against all monsters in range with perfect accuracy; it deals moderate physical damage, but the target's AC is counted against it thrice. This makes it excellent for wiping out packs of unarmoured or high-EV opponents, such as kobold vaults and swarms of killer bees, but less effective against orc warriors or other creatures with high AC. Also, because it attacks everything within range of the targeted object, you can cast it on a wall to blast anything lurking on the other side that you don't want to face directly (e.g. oklob plants).

Damage Formula

Casting this spell on a dungeon feature (like a wall or a door), generates an explosion that inflicts Nd(5+Power/5) to any monster within the radius. The radius and the number of rolls (N) can be found in the table below.

If the target is a monster, it is directly damaged for Nd(5+Power/5). After this is done, the explosion is generated. If the targeted monster is killed by the spell.

The damage done by the explosion is reduced by AC 3 times, but the damage done to a monster directly targeted by LRD ignores AC. If the target is made of ice (simulacra), the beam type of the explosion is changed from BEAM_FRAG to BEAM_ICE: this kind of explosion only suffers normal AC reduction, but the damage can be resisted with cold resistance.

Radius and Number of Dice

Target Radius N
Toenail golems 1 3
Iron golems, peacekeepers, and war gargoyles 1 4
Earth elementals, saltlings, ushabtiu, statues, and gargoyles 1 3
Orange crystal statues, orange crystal statues, Roxanne and crystal guardians 2 4
Petrifying or petrified monsters 1 3
Icy or skeletal monsters 1 3
Rock walls, stone walls, granite statues 1 3
Iron grates 1 4
Metal walls 1 4
Green crystal walls 2 4
Doors, stone arches 1 3
Petrified or petrifying player, Statue Form, Ice Form 1 3
Gargoyle player 1 2

Tips & Tricks

  • Should your target not be directly susceptible to LRD, nor near a wall, use Petrify to make it susceptible.
  • Keep in mind that LRD makes lots of noise, so anything nearby will wake up and come investigate.


Prior to 0.21, LRD would cause 1-tile larger explosions when rock, stone, metal or crystal walls were destroyed, and these explosions did more damage in the case of metal/crystal. The chance for metal walls to break depended on spell power, and for crystal it was 50% instead of 33%.

Prior to 0.10, LRD could be cast on an unnaturally hard rock wall to damage monsters on the other side. After 0.10, monsters will not be damaged if the wall is not capable of being shattered under any circumstances.