There are several buildings, crates, barrels, and so forth that hold special items. Drop a gem of some grade on it(Dwellings),or shoot it with Bolts X times[Drop Holders].

Drop holders can drop:
Drop Holders

Drop holders of a Large Stone Pile, a Barrel, and an Abandoned Dwelling.

They rarely bring nothing, but the odds are greater of empty drop holders in Iron Wizard mode, where they cannot drop Talisman Fragments, Shadow Cores or XP-related awards.

Dwellings can give:

  • Mana
  • XP
  • Shadow Cores (on rare occasion)

Dwellings bring smaller "prizes",but they always bring something except in Iron Wizard mode where XP and Shadow Cores are not awarded..