Spellbook of fire storm

spellbook of +   fire storm
Appearance	random
Abundance	0
Base price	600 zm
Weight	50
Turns to read	62
Ink to write	30–59
Spell type	attack
Level	6
Power cost	30 Pw
Direction	distant

This article is about the spellbook and corresponding spell. For the monster, see fire storm (monster).

In dNetHack, notdNetHack and notnotdNetHack, the spellbook of fire storm can be read to learn the spell of fire storm. It is a level 6 attack spell, and the spellbook takes 62 actions to read.

Generation

Spellbooks of fire storm are not randomly generated, though they can be wished for or found in bones.

Writing a spellbook of fire storm with a magic marker uses up 30 to 59 charges.

Description

The spell of fire storm is normally learned from successfully reading a spellbook of fireball as a hero that is Skilled or better in attack spells, and is a Wizard, a neutral Undead Hunter with 6+ parasites implanted, or has the spirit Paimon bound—the spell also has a corresponding spellbook as part of the items list, though it is not normally generated. The spellbook of fire storm cannot be destroyed by fire damage from traps, wands, spells, or attacks.

Items that have the "blast" object property will grant a large boost to success rates for casting fire storm while they are worn. Wearing Narya also massively lowers the failure rate of the fire storm spell.

Casting fire storm

When the fire storm spell is successfully cast, it behaves near-identically similarly to an advanced fireball spell in NetHack 3.4.3. The player is prompted to select a square to cast the fire storm at using their cursor, with the following restrictions:

• This location must be no more than 10 squares away.
• It must be an open space, i.e. the hero is not underwater or on the Plane of Water.
• The hero must be able to see the chosen square normally (i.e. it is lit and within their range of vision)
• If the hero is engulfed, the spell will always be cast on their square, which abuses wisdom and will have no effect on anything else besides the monster currently engulfing them.

Choosing an invalid location will cause the spell to have no effect.

Once a valid location is chosen, the spell will then produce 1d3+1 explosions of fire that create noise, with less noise made if they occur inside a monster engulfing the hero, and are centered on and immediately around the targeted square: the first explosion produced by the spell will always be centered on the target square, and the others will be centered on a random square within a 3x3 range around that target square. If the hero casts the spell with the spirit Naberius bound, the number of fireballs are multiplied by ³⁄₂ (rounded down to the whole), and their radius is increased so that they cover a 2-square "circular" range similar to the light radius of a lit candle. For a neutral Undead Hunter, each parasite used to empower explosive spells adds an additional fireball as well.

The fireballs each deal 4d8 base fire damage to a hero or monster caught in the explosion unless they have fire resistance, and a hero caught in the explosions also abuses strength for each one. Damage against monsters is subject to spell damage bonuses applied from the hero's casting stat (done in a manner similar to NetHack 3.4.3) as well as a +1 bonus per 3 syllables read, and then scaled based on each monster's physical size with a maximum damage multiplier of ⁷⁄₂ against gigantic monsters.

Potions in a victim's inventory may boil and explode as a result of the explosion, subjecting any monster or hero nearby to their vapors, while scrolls and spellbooks may be burnt and destroyed, and cloth and leather pieces of armor can become burnt—items destroyed this way deal +1d6 for each potion, +1 for each scroll and +1 for each spellbook.

Ice in the range of the explosions will melt into pools or moats, while fountains and already-existing pools will evaporate and dry up, with pools leaving behind pits while moats are not affected, and webs will burst into flames. Closed doors, loose potions, loose scrolls, and loose spellbooks in the range of the explosion may be destroyed, with boiled potions subjecting any monster or hero nearby to their vapors, while cloth and leather items in the explosion's range may be burnt. Spellbooks of fireball, spellbooks of fire storm and scrolls of fire cannot be destroyed by the fireballs, and the Book of the Dead will resist all forms of destruction.

Eldritch style

The spell of fire storm is also eligible for use with the eldritch style knightly stance, by selecting the fire storm spell when either first activating the stance or else changing the spell in use—the hero must have memory of the spell in order to select it for the eldritch style. Successful hits with the fire storm eldritch style active will use up the same amount of power as casting the spell directly (i.e. 30) to deal extra fire damage based on the hero's skill level in knightly stances: +1d8 at Basic, +3d8 at Skilled, and +6d8 at Expert. Each successful hit that applies bonus damage will train the knightly stances skill, and if the hero lacks enough power to cast the spell normally, then no power will be drained and the bonus damage will not be applied.

Artifacts

Invoking Tobiume casts the fire storm spell using the higher between the hero's attack spell and long sword skill levels if the hero's skill level is appropriate (and will cast fireball otherwise). The fire storm spell from invoking Tobiume deals (XL/2)+10 fire damage per explosion with the artifact's enchantment added as a bonus—the amount of fireballs depends on the skill level used, with 3 or 4 for Basic, 5-8 for Skilled, and 7-12 for Expert.