Assassin's Creed Valhalla · Armor set
Hel's Damnation Set
Hel's Damnation increases armor while a weapon is ignited and restores some health on hit while the weapon remains ignited.
How it works
Both listed effects depend on the weapon being ignited: Armor increases in that state, and hits restore some health. The source does not provide magnitudes or explain how to ignite a weapon. It lists these as the set's effects without stating a piece threshold or duration.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.