Section 03·WoW Combat Log Reference

Advanced Combat Logging

The 19-field block that powers HP timelines, position tracking, item-level breakdowns, pet attribution, and resource analysis. Plus the full power-type table.

When advanced logging is on (/console advancedCombatLogging 1), every spell event includes a 19-field block describing one of the units. This is where HP, position, item level, and pet ownership data live.

Where the Block Lives

For SPELL events (after the 9-field common header + 3-field spell prefix):

Range	Content
0–8	Common header
9–11	Spell prefix (`spellId`, `spellName`, `spellSchool`)
12–30	Advanced logging (19 fields)
31+	Event suffix (damage / heal / energize / etc.)

For SWING events (no spell prefix, so everything shifts by 3):

Range	Content
0–8	Common header
9–27	Advanced logging (19 fields)
28+	Event suffix

The 19 Fields

Offset	Field	Type	Description
0	`infoGUID`	string	Identifies which unit this block describes (matches source or target GUID)
1	`ownerGUID`	string	Pet owner GUID (`0000000000000000` if not a pet)
2	`currentHP`	long	Current hit points
3	`maxHP`	long	Maximum hit points
4	`attackPower`	int	Attack power
5	`spellPower`	int	Spell power
6	`armor`	int	Armor value
7	`absorb`	int	Current absorb shield value
8	(unknown)	int	Always seen as `0` in modern logs
9	(unknown)	int	Always seen as `0` in modern logs
10	`powerType`	int	Resource type (table below)
11	`currentPower`	int	Current resource
12	`maxPower`	int	Max resource
13	`powerCost`	int	Cost in tenths (e.g., `350` = 35 rage)
14	`positionX`	float	World X coordinate
15	`positionY`	float	World Y coordinate
16	`uiMapID`	int	Zone / map ID
17	`facing`	float	Direction in radians
18	`itemLevel`	int	Equipped item level

The infoGUID rule: the advanced block describes ONE unit, identified by infoGUID at offset 0. Always match infoGUID against the source and target GUIDs from the header — don't assume which one it is, because it depends on the event type:

Event Block describes
SPELL_DAMAGE, SPELL_PERIODIC_DAMAGE, RANGE_DAMAGE Target
SPELL_HEAL, SPELL_PERIODIC_HEAL Target (the healed unit)
SPELL_ENERGIZE, SPELL_DRAIN, SPELL_LEECH Target
SWING_DAMAGE Source (the swinger)
SWING_DAMAGE_LANDED Target (same swing, target side)
ENVIRONMENTAL_DAMAGE Target (the player who got hurt)

Empirically verified across multiple raid and M+ logs.

Event	Block describes
`SPELL_DAMAGE`, `SPELL_PERIODIC_DAMAGE`, `RANGE_DAMAGE`	Target
`SPELL_HEAL`, `SPELL_PERIODIC_HEAL`	Target (the healed unit)
`SPELL_ENERGIZE`, `SPELL_DRAIN`, `SPELL_LEECH`	Target
`SWING_DAMAGE`	Source (the swinger)
`SWING_DAMAGE_LANDED`	Target (same swing, target side)
`ENVIRONMENTAL_DAMAGE`	Target (the player who got hurt)

Power Types

The powerType field tells you which resource the unit uses:

Value	Resource
0	Mana
1	Rage
2	Focus
3	Energy
4	Combo Points
5	Runes
6	Runic Power
7	Soul Shards
8	Lunar Power
9	Holy Power
11	Maelstrom
12	Chi
13	Insanity
16	Arcane Charges
17	Fury
18	Pain
19	Essence

Some specs use multiple resources (Energy + Combo Points, Mana + Arcane Charges). The advanced block only carries the primary resource — secondary resources get tracked via SPELL_AURA_APPLIED_DOSE or class-specific events.

Citing this page

If this reference helped, please link back so others can find it. Suggested citation:

Advanced Combat Logging — WoW Combat Log Reference (WowCoach.gg). https://wowcoach.gg/docs/combat-log/advanced-logging