From Lexicanum

The Iron Halo is part of the Space Marine Armoury. It is a special award given to a Space Marine who has shown exceptional initiative or bravery on the battlefield. It incorporates a powerful conversion field, similar to the Rosarius or Refractor Field.

Famous Iron Halo users

• Marneus Calgar, Chapter Master of the Ultramarines
• Brother-Captain Sicarius of the Ultramarines
• Commander Dante, Chapter Master of the Blood Angels

Sources

• Warhammer 40,000: Wargear
• Codex: Blood Angels (4th Edition)
• Codex: Space Marines (4th Edition)

Related Articles

• Rosarius
• Refractor Field