Spoilers #1: Items Eligible for Upgrade
Without Heart of Winter, only four items can be upgraded:
- Girdle of Gond
- Winter Wolf Pelts
- Yeti Pelts
Three new items are available as well: Boomerang Dagger +1, Elven Chain, and Returning Dart +2
With Heart of Winter, more items are available for upgrade:
- Bren Muller's Crossbow
- Mystery of the Dead
- The Sword of Myrloch Vale
- Young Rage
Two monsters drop items which can be upgraded, similar to rhino beetles and umber hulks.
Three more new items are available as well: Bag of Plenty +1, Case of Plenty +1, and Quiver of Plenty +1.