The Helios Defence Missile is known to have been used in the Ironstorm Missile Pod, particularly the larger variant carried by the Acastus Knight Porphyrion. These missiles are equipped if the Knight is heading into battle-zones where the danger from airborne assault is apparent.
- The Horus Heresy - Book Seven: Inferno (Forge World Series) by Alan Bligh, pp. 196-197
- Imperial Armour Index: Forces of the Astra Militarum (8th Edition), pg. 95
- Imperial Armour Index: Forces of Chaos (8th Edition), pg. 63
- Forge World Webstore - Acastus Knight Porphyrion