From Lexicanum

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The Kromarch was the highest ranking Imperial officer on El'Phanor before it was destroyed during the 4th Black Crusade by Abaddon. The world was utterly devastated and left a Dead World by the forces of Chaos.

Citadel of Kromarch

The Citadel of Kromarch was the greatest fortress on the El'Phanor and home to the Kromarch. It was here that the greatest defence of the planet was led but was ultimately crushed by the superior forces of Abaddon the Despoiler.

Sources

• Codex: Chaos (2nd Edition)
• Codex: Chaos Space Marines (3rd Edition)
• Liber Chaotica