Expedition is one of the best way for you to gain additional resources.

With every completion, you are guaranteed to earn Hero EXP and Gold. You will occasionally receive Mana Stones and Ancient Coins, and rarely crystals.

You can “level up” Expedition with crystals only and these level up’s give you additional perks in regards to expeditions.

Expedition Level
Level 1: 10% more general rewards
Level 2: 10% increased chance of gaining additional rewards
Level 3: 10% discount on immediate completion
Level 4: 2nd expedition slot unlocked
Level 5: 15% increased chance of finding a relic
Level 6: Upgrade from 10% discount to 20% discount on immediate completion.
Level 7: Upgrade from 10% to 20% more general rewards
Level 8: Upgrade from 10% to 20% increased chance of gaining additional rewards
Level 9: Upgrade from 15% to 30% increased chance of finding a relic
Level 10: 3rd expedition slot unlocked

Expedition Completion Rewards by Region