Ealen IV was a Covenant world near the UNSC's outer colonies that was terraformed to create plasma.
- Main article: Battle of Ealen IV
At some point prior to 2552, the Covenant terraformed Ealen IV in order to harvest industrial-grade plasma generated by the planet's volatile atmosphere. In 2558, Ealen IV was the site of a peace talk between Fleet Admiral Lord Hood, Kaidon Thel 'Vadam, and Jiralhanae Chieftain Lydus. During the negotiations, an army of Jul 'Mdama's Covenant attacked the delegates. The crew of the UNSC Infinity, the Swords of Sanghelios, Lydus' pack, and Jul 'Mdama's Covenant all suffered moderate to high casualties during the first few minutes of the engagement.
- Halo: Escalation
- Issue #1 (First appearance)
- ↑ Halo: Escalation Issue #1 - page 16