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Improved Fireball/Invoked Devastation
School Arcane
Type Damage
Range Missile/Ball
Base cost 30
Equivalent item crystal of fire

Improved Fireball is an arcane offensive spell in ADOM. It allows the caster to throw a magical projectile on a designated tile which explodes in a ball of fire upon reaching its destination.

As the name implies Improved Fireball is a more powerful version of the Fireball spell and is ultimately a ball-type spell thus sharing the following common features:

  • Effective range is approximately a circle (counting in tiles) with the radius based on PC's Willpower
  • Attacking monsters with Improved Fireball while invisible will betray the PC's location to them
  • Improved Fireball will damage everything in its effective area including monsters in walls and outside the PC's line of sight

Improved Fireball is the only spell in ADOM which can be targeted as a standard ranged attack. The projectile also behaves in the same manner as missiles/thrown objects — it will be stopped by walls, doors and other monsters if these happen to be in the flight trajectory.

Unlike other ball spells Improved Fireball will damage the PC if (s)he is caught in the explosion. Therefore, it should be used with caution and is normally ineffective at close range (unless the PC and his/her equipment is resistant to fire).

A large number of enemies in ADOM are immune to fire damage, making Improved Fireball useless against them (see the full list here). Some monsters are, on the other hand, highly vulnerable to fire (see the full list here). Improved Fireball is exceptionally powerful in the Frost Giant Jarl Caves.

As any other fire spell Improved Fireball is suppressed in the Ice Queen Domain. Attempting to cast it will drain the usual spell cost but produce no effect except an extra message.

See below for ball spell damage comparison.

StatsEdit

Damage

Improved Fireball damage is dependent on PC's level (L) and spell proficiency (P). The exact formula is the following:

{2 + [(L + P) / 5]}d8 + L

Radius

Improved Fireball projectile explosion radius is solely dependent on PC's Willpower (W). The exact formula is the following:

max{2, [W / 8]}

Only every even value signifies a different blast size. Radius value should be divided by 2 and rounded down — the resulting number corresponds to actual circle radius counting in level tiles. In practice, the observable increase in spell radius will first occur when the PC reaches Willpower score of 32. Every 16 more points of Willpower (48, 64, etc.) will trigger another increase.

Ball spell radius 2, 3 (1-31 points of Willpower)
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Ball spell radius 4, 5 (32-47 points of Willpower)
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Ball spell radius 6, 7 (48-63 points of Willpower)
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Spell cost

Casting Improved Fireball costs its base value (30) which is increased/decreased according to active bonuses and penalties and additional value dependent on throwing distance (D). The exact formula looks the following way:

30 + ({D / 2} + 1) * 4

Distance points are calculated in the same way as ball spell radius (see schemes above for examples).

It should be noted that extra distance cost does not seem to be affected by spellcasting bonuses and penalties. This significantly decreases the spell damage/cost efficiency when choosing targets far from the PC.

Extra

Improved Fireball will destroy items on the floor, herbs, webs, and ice bridges. It will also damage the PC and destroy his/her equipment if thrown too close.

Targeting Improved Fireball in such a way that a drakeling PC is caught in explosion will raise his/her temperature and speed due to the race cold-blooded nature.

Using Improved Fireball in the Animated Forest is not recommended as this will enrage all animated trees on the level.

Improved Fireball can be used to cook corpses and melt iron items into iron ingots. The corresponding item(s) should be lying on the floor for this to happen and may need several castings to be affected.


Ball spell comparisonEdit

Level 1 PCEdit

Spell level +0 +10 +20 +30
Min Max Av Min Max Av Min Max Av Min Max Av
Fireball 5 25 15 15 35 25 25 45 35 35 55 45
Ice Ball 5 29 17 15 39 27 25 49 37 35 59 47
Lightning Ball 5 33 19 15 43 29 25 53 39 35 63 49
Acid Ball 5 37 21 15 47 31 25 57 41 35 67 51
Improved Fireball 3 17 10 5 33 19 7 49 28 9 65 37

Level 20 PCEdit

Spell level +0 +10 +20 +30
Min Max Av Min Max Av Min Max Av Min Max Av
Fireball 27 62 44 37 72 54 47 82 64 57 92 74
Ice Ball 27 69 48 37 79 58 47 89 68 57 99 78
Lightning Ball 27 76 51 37 86 61 47 96 71 57 106 81
Acid Ball 27 83 55 37 93 65 47 103 75 57 113 85
Improved Fireball 26 68 47 28 84 56 30 100 65 32 116 74

Level 50 PCEdit

Spell level +0 +10 +20 +30
Min Max Av Min Max Av Min Max Av Min Max Av
Fireball 64 134 99 74 144 109 84 154 119 94 164 129
Ice Ball 64 148 106 74 158 116 84 168 126 94 178 136
Lightning Ball 64 162 113 74 172 123 84 182 133 94 192 143
Acid Ball 64 176 120 74 186 130 84 196 140 94 206 150
Improved Fireball 62 146 104 64 162 113 66 178 122 68 194 131

Some information taken with permission from Andy Williams' Guidebook.

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