Signature (‘SPL  ’)

Version (‘V1 ‘)

Spell Name - Unidentified (strref)

Completion Sound

Flags

Spell type:

• 0 ⟶ Special
• 1 ⟶ Wizard
• 2 ⟶ Priest
• 3 ⟶ Psionic
• 4 ⟶ Innate
• 5 ⟶ Bard song

Exclusion Flags

Casting Graphics

Primary Type (School) (IWD: school.2da, BG2:mschool.2da)

Secondary Type (BG2:msectype.2da)

Spell Level

• There is no good reason for a Special/Psionic/Innate/Bard song to be any Spell level except 1.
• If the SPL is never learned/gained (only force-cast by script/opcode), Spell level doesn’t matter, but there may be some niche cases that check it (f.i. HaveSpell()).

Spellbook icon (BAM). The engine replaces the last character of this filename with a C.

Spell Description - Unidentified (strref)

Extended Header offset

Extended Header count

Feature Block Table offset

Casting Feature Block offset (these feature blocks may not use target type 2)

Casting Feature Block count

Spell form

• 1 - Standard
• 2 - Projectile

• bit 2: ‘Friendly’ ability (PST only)

Location

• 0 ⟶ None
  • Ability will not be selectable through the UI (but still available to scripts and spell-casting opcodes).
• 1 ⟶ Weapon
  • ITM only.
• 2 ⟶ Spell
  • Ability can be selected from “Cast Spell (F7)” button, and from Quick-spell buttons.
• 3 ⟶ Item
  • ITM only.
• 4 ⟶ Innate
  • Ability can be selected from “Special Abilities (F12)” button.
• 5+ ⟶ As 0.

Memorised icon (BAM). The engine replaces the last character of this filename with a B.

Target

• 0 ⟶ Invalid (cannot be selected)
• 1 ⟶ Living actor
  • Targets Portrait, Creature/Actor, Container, or Door. Checks Range.
• 2 ⟶ Inventory
  • Can’t be activated manually.
• 3 ⟶ Dead actor
  • As Living Actor. It really just ignores any Range requirement, including being in the same area.
• 4 ⟶ Any point within range
  • Targets location. Checks Range.
• 5 ⟶ Caster
  • Targets Self.
• 6 ⟶ Crash
  • Can’t be activated manually.
• 7 ⟶ Caster
  • Targets Self. In particular:
    • Cast instantly (even while the game is paused).
    • Ignores one spell per round rule.
    • Ignores Silence, Spell Failure, Dead Magic, Wild Surge, Outdoors Only, Non-combat, probably a few other rules.

Target count

• Only usable with Ability Targets 1, 3, or 4.
• Targeting reticle will display amount remaining while selecting targets.
• Double-clicking a target/location will target it for the remaining amount.
• Regardless of the number of targets, only a single “Memorization” will be expended.
• This feature cannot be utilized by scripts.
  • Scripts will treat this field as if it’s always 1.

Range

Level Required

Casting Time

Times per day

Count of feature blocks

Offset to feature blocks

Projectile (BG2: projectl.ids. Note: in BG2, this value is off-by-one from projectl.ids value. I.e. binary value of 2 corresponds to 0x1 - ARROW)

Opcode Number

Target type

• 0 ⟶ None
• 1 ⟶ Self
• 2 ⟶ Projectile target
• 3 ⟶ Party
• 4 ⟶ Everyone
• 5 ⟶ Everyone except party
• 6 ⟶ Caster group
• 7 ⟶ Target group
• 8 ⟶ Everyone except self
• 9 ⟶ Original caster

Power

Parameter 1

Parameter 2

Timing mode

• 0 ⟶ Instant/Limited
• 1 ⟶ Instant/Permanent
• 2 ⟶ Instant/While equipped
• 3 ⟶ Delay/Limited
• 4 ⟶ Delay/Permanent
• 5 ⟶ Delay/While equipped
• 6 ⟶ Limited after duration
• 7 ⟶ Permanent after duration
• 8 ⟶ Equipped after duration
• 9 ⟶ Instant/Permanent (after Death)
• 10 ⟶ Instant/Limited
• 4096 ⟶ Absolute duration

Dispel / Resistance

The default behaviour is that effects cannot be dispelled and ignore magic resistance.

• bit 0 ⟶ Can be dispelled, affected by magic resistance
• bit 1 ⟶ Ignores magic resistance (when used in combination with bit 0)

This can also be presented in the more traditional way:

• 0 ⟶ Natural/Nonmagical
• 1 ⟶ Can be dispelled/Affected by resistance
• 2 ⟶ Cannot be dispelled/Ignores resistance
• 3 ⟶ Can be dispelled/Ignores resistance

The only difference between 0 and 2 is that 0 will automatically convert to 2 when targeting yourself.

Duration

Probability 1

Probability 2

Resource

Dice Thrown / Maximum Level

Dice Sides / Minimum Level

Saving throw type

• bit 0 ⟶ Spells
• bit 1 ⟶ Breath
• bit 2 ⟶ Paralyze / Poison / Death
• bit 3 ⟶ Wands
• bit 4 ⟶ Petrify / Polymorph
• bit 10 ⟶ Ignore primary target (EE only)
• bit 11 ⟶ Ignore secondary target (EE only)
• bit 24 ⟶ Bypass mirror image (EE/TobEx only)
• bit 25 ⟶
  • Ignore difficulty (EE only)
  • Limit effect stacking (ToBEx only)
• bit 26 ⟶ TobEx internal (don’t use)

Saving Throw Bonus

TobEx: Stacking ID. Checked when bit 25 of the Saving Throw Type is set.

If two effects of the same opcode are applied, both have Limit Effect Stacking bit set, and both have the same stacking ID, then the latter applied effect is suspended in application until the former effect expires. Regardless of whether it is applied, the latter effect will expire at the same time that it would expire if it was applied. In other words, the total duration of some non-stacking effect opcode is not extended because more than one copy of the effect was applied.

Stacking IDs are unique to the opcode being applied. To maintain uniqueness of stacking IDs between different mods, one recommendation is to use the higher word of Special as the modder’s Infinity Engine Community Prefix, then use the lower word as an identifying ID. For example, 0x41360001 (‘A6’ 0x0001).