TheWoWDBCity of Threads
Izo, the Grand Splicer Guide
Izo, the Grand Splicer in City of Threads, quoted from the Adventure Guide. Database holds the raw abilities and the full loot table.
30-second TL;DR
Adventure Guide says
- Izo creates a set of Shifting Anomalies, then shows off her mastery of transformation with Umbral Weave and Tremor Slam .
- Upon reaching 100 energy, Izo attempts to eliminate her target and anyone near them with Process of Elimination.
- Tanks: Shifting Anomalies inflict damage and knock back players on contact.
- Healers: Shifting Anomalies inflict damage and knock back players on contact.
- Damage dealers: Webs created by Umbral Weave can be attacked and destroyed.
Overview
Adventure Guide says
Izo creates a set of Shifting Anomalies, then shows off her mastery of transformation with Umbral Weave and Tremor Slam. Upon reaching 100 energy, Izo attempts to eliminate her target and anyone near them with Process of Elimination.
- Shifting Anomalies inflict damage and knock back players on contact.
- Process of Elimination inflicts heavy damage to Izo's target and to nearby players.
- Webs created by Umbral Weave can be attacked and destroyed.
- Shifting Anomalies inflict damage and knock back players on contact.
- Process of Elimination inflicts heavy damage to Izo's target and to nearby players.
- Shifting Anomalies inflict damage and knock back players on contact.
- Process of Elimination inflicts heavy damage to Izo's target and to nearby players.
- Splice inflicts significant damage to all party members.
Tank mechanics
Adventure Guide says
- Shifting Anomalies inflict damage and knock back players on contact.
- Process of Elimination inflicts heavy damage to Izo's target and to nearby players.
Healer mechanics
Adventure Guide says
- Shifting Anomalies inflict damage and knock back players on contact.
- Process of Elimination inflicts heavy damage to Izo's target and to nearby players.
- Splice inflicts significant damage to all party members.
DPS mechanics
Adventure Guide says
- Webs created by Umbral Weave can be attacked and destroyed.
- Shifting Anomalies inflict damage and knock back players on contact.
- Process of Elimination inflicts heavy damage to Izo's target and to nearby players.
Boss abilities
| Ability | Adventure Guide | Notes |
|---|---|---|
 Shifting Anomalies | ||
 Splice | ||
 Tremor Slam | ||
 Gorge | ||
 Umbral Weave | ||
 Process of Elimination |
Loot
Every name is a TheWoWDB item page. Hover the row for the first-party tooltip.
Mounts, toys, achievements, transmog
Only rows the journal loot table or an achievement title can prove for this encounter.
Achievements
City of Threads · Heroic: City of Threads · Mythic: City of Threads
Entrance and instance
City of Threads is a dungeon in the Adventure Guide. See the City of Threads database page for the raw journal, map, and loot grid. This guide does not invent coordinates or a walking path.
Related bosses
Player strategy
This page quotes the Adventure Guide. It does not add player strategy such as positioning, assignments, stack or spread calls, or cooldown timings unless that sentence is already in the journal.
Questions
What does the Adventure Guide say about Izo, the Grand Splicer?
Izo creates a set of Shifting Anomalies, then shows off her mastery of transformation with Umbral Weave and Tremor Slam .
How many abilities does Izo, the Grand Splicer have?
The current datamine lists 6 named abilities on the Izo, the Grand Splicer encounter.
What does Izo, the Grand Splicer drop?
The Adventure Guide lists 8 drops. Each name links to its TheWoWDB item page. The full table also lives on the City of Threads database page.
Does Izo, the Grand Splicer change on Heroic or Mythic?
The current Adventure Guide text for this encounter does not include separate Heroic or Mythic sentences we can quote. If a later client build adds them, they appear here automatically.
Where does this guide's text come from?
Quoted Adventure Guide sections come from TheWoWDB's retail datamine (client build 12.1.0.69587, ingested 2026-09-01). Player strategy such as positioning, assignments, and cooldown timings is omitted unless that sentence is already in the journal.
Source and build
This page quotes the Adventure Guide. It does not add player strategy such as positioning, assignments, stack or spread calls, or cooldown timings unless that sentence is already in the journal. Quoted sections come from TheWoWDB Adventure Guide datamine (client build 12.1.0.69587, ingested 2026-09-01). Ability names link to first-party spell pages. When a newer retail build is ingested, this page updates with it.