Orbs are acquired in a number of ways in the Undead Throne.
1. Loot. Orbs can be found as loot in chests throughout the Undead Throne, specifically in the Cursed Library, Undead Barracks, and in the catacombs beneath the Undead Cemetery.
2. Kill Enemies. Some enemies have a chance of dropping orbs when killed, including the skeletons in the Undead Barracks and the zombies in the Undead Cemetery.
3. Complete Objectives. Completing objectives, such as defeating bosses, uncovering hidden secrets, or completing quests, can reward players with Orbs.
4. Crafting. Orbs can also be crafted by combining certain materials, such as bones, souls, and other items, at the Alchemy Station in the Undead Throne.
5. Rewards: Orbs can also be rewarded for completing certain achievements or by participating in events.