With the Dark Compact of Fiends, all Fiendish (demons, devils, etc.) minions and servitors summoned to the realms operate under a minimum of the Simple Compact of Dark Shelter. Because of this compact, all fiends, no matter who summons them enjoys the same benefits. It is even stronger within the Curtain of Night. This is sealed with a blood rite of the Church of Darkness from all of the Unholy Trio.
Those fiendish entities summoned with the Dark Compact of Fiends in the Steel Realms possess a virulent corruption of the blood called Ironrot that causes any weapon made with iron to rot – it will weaken, blunt, break, crack, and eventually crumble. Each time an iron based weapon strikes the fiend, it gets progressively weaker. The effect is permanent – it cannot be reversed except in mystically empowered armaments. Normal armaments are susceptible to Ironrot.
Ironrot Resistant: The Virtue Forged as well as the Heavy Virtue armaments of Umbak (and the early versions of this – the Blood Blades of Umbak), the merchant cities Blades of Renown. Elven Mytrial Armaments and Silvered Weapons of the Steel Realms cannot be corrupted by Ironrot.
When it reaches zero, it crumbles:
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