This incredibly fine, flexible metal is found only in the deep mines of Nidavellir in the Heroic Domains of Ysgard. It is not suitable for making an entire suit of armour, but small sections of heartwire mail can be incorporated into chain shirts, chainmail or heavy armour to reinforce vital areas. This reinforcement has the effect of increasing the wearer’s AC by +2 solely for purposes of the roll to confirm a critical hit. The heartwire is so fine and light that it does not increase the armour’s weight.
| Type of Ysgardian Heartwire Item | Item Cost Modifier |
|---|---|
| Armour | +1,500 gp |
Source: Book of Exalted Deeds (Page 38), Arms and Equipment Guide (Page 20)