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Lightning Bolt/Divine Wrath
School Arcane, Clerical
Type Damage
Range Bolt
Base cost 12
Equivalent item wand of lightning
wand of ball lightning

Lightning Bolt is an offensive bolt spell in ADOM. It allows the caster to fire a lightning in a specified direction, damaging every creature (that doesn't evade or resist) in its path.

Lightning Bolt is a bouncing bolt spell, thus sharing the following features:

  • The spell travels in a straight line in one of the 8 possible directions.
  • Lightning Bolt damage decreases slightly as it travels.
  • Monsters are able to shrug off the bolt, completely resisting the damage.
  • Lightning Bolt will disappear as soon as it hits a door.
  • Lightning Bolt will bounce off a wall in the opposite direction if it was travelling perpendicular to this wall (or hits a corner) or will turn by 90 degrees if it was travelling diagonally. See section below for more information.
  • Damaging monsters with a bolt spell while invisible will not betray the PC's position to them.

All elemental bolt spells are roughly comparable in terms of damage. Lightning Bolt is slightly superior to Fire Bolt due to the fact that a relatively low number of monsters resist shock damage. The spell destroys items on the floor very effectively and is probably not recommended for clearing vaults.

Lightning Bolt deals extra damage to metallic constructs, which include almost all inhabitants of Darkforge, making the spell more efficient in this location. Unfortunately, high spell proficiency is required to clear Darkforge as monsters there shrug off bolt spells with ease.

StatsEdit

Damage

Lightning Bolt damage is dependent on the PC's level (L) and proficiency (P) with the spell. As mentioned above, it slightly loses in firepower as it travels further from the caster (r stands for the amount of remaining travel points — it starts equal to the spell radius and decreases by 1 point per each tile). The exact formula for the spell damage looks the following way:

{max[4, (L + P) / 3]}d6 + r

Radius

Lightning Bolt radius depends on the PC's Willpower score (W) and level (L). The exact formula looks the following way:

W / 4 + L / 4 + 2

Example

In the example situation a level 6 Wizard with 15 Willpower casts a + 2 Lightning Bolt directly to the east. According to the formulae above, the effective spell damage will be 4d6 + r and spell radius will be equal to 6.

r=6543210
#########
#.......######
#.@.g...od...#
#.......####.#
#########

The goblin ('g') will receive 4d6 + 4 points of damage, the orc (monster) ('o') will receive 4d6 points of damage, while the rabid dog ('d') will not be affected, as the bolt will disappear right before it.

Extra

Bouncing

Bolt bouncing in ADOM works in an identical way to real light reflection, although all environmental properties in the game are extremely simplified. Walls in ADOM appear to be perfect reflective surfaces and spell rays travel in a such a way that they can only hit walls either at 45 or 90 degrees angle.

Each time a bolt bounces off a wall, it will use up 1 point of effective range.

In case a bolt hits a wall in a perpendicular fashion (at 90 degrees), it will change its direction to the opposite of which it was travelling:

Bolt radius is 6:
  (1)           (2)           (3)
#######       #######       #######
#.....#       #.....#       #.....#
#.@---#    => #.@...#    => #.@.--#
#.....#       #.....#       #.....#
#######       #######       #######
1) Bolt travels in the eastern direction for 3 tiles until it reaches the wall.
2) 1 range point is used for bouncing.
3) Bolt travels in the opposite direction for (6 - 3 - 1 = 2) remaining tiles.

In case a bolt hits a wall while moving diagonally, it will change its direction by 90 degrees.

Bolt radius is 6:
  (1)            (2)            (3)
########       ########       ########
#@.....#       #@.....#       #@..../#
#.\....#   =>  #......#    => #..../.#
#..\...#       #......#       #.../..#
########       ########       ########

1) Bolt travels in the south-eastern direction for 2 tiles until it reaches the wall.
2) 1 range point is used for bouncing.
3) Bolt turns by 90 and continues moving for (6 - 2 - 1 = 3) tiles in the north-eastern direction.

When a bolt hits a room corner (inner or outer), it will bounce in the opposite direction, just as if hit a wall in a perpendicular fashion.

Bolt radius is 4, inner corner:
  (1)            (2)            (3)
########       ########       ########
#...@..#       #...@..#       #...@..#
#....\.#   =>  #......#    => #......#
#.....\#       #......#       #.....\#
########       ########       ########
1) Bolt travels in the north-eastern direction for 2 tiles until it reaches the corner.
2) 1 range point is used for bouncing.
3) Bolt travels in the opposite direction for the remaining range points (4 - 2 - 1 = 1).
Bolt radius is 4, outer corner:
  (1)            (2)            (3)
#######       #######        #######
#...@.#       #...@.#        #...@.#
#####\##   => #####.##    => #####.##
    #.\.          #...           #.\.
    #..#          #..#           #..#
    #..#          #..#           #..#
1) Bolt travels in the north-eastern direction for 2 tiles until it reaches the corner.
2) 1 range point is used for bouncing.
3) Bolt travels in the opposite direction for the remaining range points (4 - 2 - 1 = 1).


Some information taken with permission from Andy Williams' Guidebook.

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