The Fourth Black Crusade was Abaddon the Despoiler’s attack on the Grand Citadel of Kromarch in 001.M34, a fortress that anchored the Imperium’s defences around the Cadian Gate. It’s remembered as a Chaos victory in purpose but a bloody retreat in practice, and it’s one of the clearer examples of Abaddon fighting a war on his own terms.
What the fourth black crusade actually was
It’s one of the thirteen Black Crusades launched by Abaddon out of the Eye of Terror. This one is also called the Devastation of El’Phanor, after the world where the fighting peaked, and the Death of the Kromarch, after the ruler whose line ended there.
The target wasn’t Cadia itself. It was the Grand Citadel of Kromarch, a linchpin in the Cadian Gate’s defensive network. Take that out and you’ve opened a hole in the Imperium’s main plug against Chaos incursions.
How the campaign played out
Abaddon had learned from his earlier crusades. Rather than throwing everything at Cadia, he besieged its walls with part of his force while taking the bulk of the Black Legion out into the wilds of Segmentum Obscurus.
He landed on El’Phanor personally and led the assault on the citadel. The walls eventually crumbled, and Drach’nyen, his daemon sword, sundered the gates. Inside, Abaddon wiped out the ancient line of Kromarch and destroyed the monolith at the citadel’s heart.
Then he lost the plot, at least militarily. He gave his troops free rein over the city, and no man, woman or child was spared. That delay let Imperial forces regroup and counterattack. They hit the Chaos tide hard and drove it off-world, with few survivors escaping back to the Eye of Terror.
Why it matters
The Fourth Black Crusade shows Abaddon’s real strategy. He wasn’t trying to hold ground in realspace forever. He was gutting the Imperium’s defensive infrastructure piece by piece, and the Kromarch’s citadel was exactly that kind of target.
It also connects to the wider Long War. Sources disagree on some details, and the exact sequence of events around El’Phanor and Eriad VI isn’t fully settled depending on which codex or novel you’re reading.
- Destroyed the Grand Citadel of Kromarch, a key node in the Cadian Gate’s defences
- Ended the ancient line of Kromarch and shattered the monolith inside the citadel
- Abaddon also bombarded Eriad VI to destroy its Necron pylons, and succeeded
- Ended in a Chaos retreat after Abaddon’s forces overindulged in the sack of the city
Key facts at a glance
| Detail | Value |
|---|---|
| Date | 001.M34 |
| Location | Segmentum Obscurus, El’Phanor |
| Chaos commander | Abaddon the Despoiler |
| Imperial commander | Kromarch (killed in action) |
| Outcome | Chaos retreat, but Abaddon’s objective achieved |
Key facts
- Also called the Devastation of El’Phanor and the Death of the Kromarch
- Launched in 001.M34 by Abaddon the Despoiler
- Targeted the Grand Citadel of Kromarch, a linchpin of the Cadian Gate
- Abaddon used Drach’nyen to break the citadel gates
- Ended with a Chaos retreat after Imperial forces regrouped
- Abaddon also destroyed Necron pylons on Eriad VI during the crusade
FAQ
Was the Fourth Black Crusade a win for Abaddon?
In terms of his objective, yes. He destroyed the citadel and killed the Kromarch. But his forces were wiped out on El’Phanor after he let them sack the city, so it was a costly victory.
What was the Grand Citadel of Kromarch?
It was a major fortress in the Cadian Gate’s defensive chain, home to the Kromarch and his line. Its destruction opened a gap in the Imperium’s defences against the Eye of Terror.
When did the Fourth Black Crusade happen?
It began in 001.M34, making it one of the earlier Black Crusades. The exact duration isn’t consistently stated across sources.