Signature (‘ITM ‘)

Version (‘V1 ‘)

Unidentified Name (strref)

Identified Name (strref)

BG1, BG2, BGEE:
Replacement item (ITM)

PSTEE:
Drop sound - played when the item is dropped in the inventory (WAV)

Flags

Item type

Usability bitmask

Item animation

Min Level

Min Strength (unused in BG1)

Min Strength Bonus (unused in BG1)
Note: A strength of 19 or above is considered to have a Strength Bonus of 0, and would therefore not be able to equip any weapon with a Strength Bonus restriction.

Kit Usability 1

Min Intelligence (unused in BG1)

Kit Usability 2

Min Dexterity (unused in BG1)

Kit Usability 3

Min Wisdom (unused in BG1)

Kit Usability 4

Min Constitution (unused in BG1)

Weapon Proficiency

Min Charisma

Price

Stack amount

Inventory icon (BAM)

Lore to ID

Ground icon (BAM)

Weight

Unidentified Description (strref)

Identified Description (strref)

Description icon (BAM)

Enchantment

Offset to extended headers

Count of extended headers

Offset to feature blocks

Index into equipping feature blocks

Count of equipping feature blocks

Attack type

• 0 = None
• 1 = Melee
• 2 = Projectile
• 3 = Magic
• 4 = Launcher

ID Req.

• bit 0: ID Required
• bit 1: Non-ID Required

Location

• 0 = None
• 1 = Weapon
• 2 = Spell
• 3 = Equipment
• 4 = Innate

Alternative dice sides

Use icon

Target type

• 0 = Invalid (cannot be selected)
• 1 = Creature
• 2 = Crash
• 3 = Character potrait
• 4 = Area
• 5 = Self
• 6 = Crash
• 7 = None (Self, ignores game pause)

Target count

Range

Projectile type

• 0 = None
• 1 = Arrow
• 2 = Bolt
• 3 = Bullet
• 40 = Spear
• 100 = Throwing Axe

Alternative dice thrown

Speed

Alternative damage bonus

THAC0 bonus

A successful hit will always occur if any of the conditions below is true

• This field is set to 32767
• The target creature(s) is STATE_HELPLESS
• The target is affected by time stop

Dice sides

Primary type

Dice thrown

Secondary type

Damage bonus

Damage type

• 0 = None
• 1 = Piercing/Magic
• 2 = Blunt
• 3 = Slashing
• 4 = Ranged
• 5 = Fists
• 6 = Piercing/Blunt (more) (BG2)
• 7 = Piercing/Slashing (more) (BG2)
• 8 = Blunt/Slashing (less) (BG2)

Count of feature blocks

Index into feature blocks

Charges

Charge depletion behaviour

• 0 = Don’t vanish
• 1 = Expended
• 2 = Expended (w/o sound)
• 3 = Recharge each day

Flags

Projectile animation (projectl.ids/missile.ids)

Melee animation

Bow/Arrow qualifier (0=No, 1=Yes)

Crossbow/Bolt qualifier (0=No, 1=Yes)

Misc. Projectile qualifier (0=No, 1=Yes)

Opcode Number

Target type

• 0 = None
• 1 = Self (pre-projectile)
• 2 = Pre-target
• 3 = Party
• 4 = Everyone (inc. party)
• 5 = Everyone (excl. party)
• 6 = Everyone matching specific value of caster (or Party if cast by party member)
• 7 = Everyone matching specific value of target (In ITM: ranged ability type only, otherwise no target)
• 8 = Everyone (excl. caster)
• 9 = Self (post-projectile)

Power

Parameter 1

Parameter 2

Timing Mode

• 0 = Duration
• 1 = Permanent
• 2 = While equipped
• 3 = Delayed Duration
• 4 = Delayed
• 5 = Delayed (transforms to 8)
• 6 = Duration?
• 7 = Permanent?
• 8 = Permanent (unsaved)
• 9 = Permanent (after Death)
• 10 = Trigger
• 4096 = Absolute duration

NB. all effects except those with Timing mode ‘9’ are removed by death.

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)
• bit 2: Bypasses deflection/reflection/trap opcodes (only in EE games patched to v2.0+ / external EFF files)
• bit 31: Effect was applied by an ITM (only present in EE games patched to v2.0+ / external EFF files). It is set by the engine if the effect’s source ITM is identified. This bit is only used by opcode #324 which checks it to determine whether it should set STRREF_FEEDBACK_IMMUNE_RESOURCE (see ENGINEST.2DA) to the ITM’s general or identified name

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

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

Duration

Probability 1

Probability 2

Note: The BG1 engine treats probability as a single word, effects are applied in the range 0-probability.
Note: Other engines treat probability as two values, effects are applied in the range probability <= x <= probability.
Probability range is 0-99

Resource

Dice Thrown

Dice Sides

Saving Throw Type

• bit 0: Spells
• bit 1: Breathe
• bit 2: Death
• bit 3: Wands
• bit 4: Polymorph
• bit 10: Ignore primary target – Line AoE projectile doesn’t affect end target (EE only)
• bit 11: Ignore secondary target – Line AoE projectile doesn’t affect bystanders (EE only)
• bit 24: Bypass mirror image (EE/TobEx only)
• bit 25: EE - ignore difficulty; TobEx - limit effect stacking
• bit 26: TobEx internal (don’t use) - suspend effect application

NB. If more than 1 saving throw type is specified, the target rolls against their best save.

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).