You recite a scroll of identify which dissolves.
You feel informed:
Object 'helmet helm skull dragon forge', Item type: ARMOR
Item is: MAGIC
Weight: 2, Value: 45000, Worn in: TAKE HEAD
AC-apply is -1.0
Can affect you as:
Affects: RESIST_FIRE by 1
Affects: HITPOINT by 10
Only those who are at least apprentice thieves, warriors, bards, or monks
may use this item.
Forge is still the same, just added resist fire and new restricts. The added resist fire is nice - from the dragon's head that had resist fire on it.