The Stolen Frozen Treasures is a Voucher that can be donated to the Stronghold Coffer for 75 Frozen Treasures resources. Stolen Frozen Treasures can drop from any enemy in the Stronghold.
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Stolen Frozen Treasures

A chest containing stolen Frozen Treasures.
This can be donated to your Stronghold's Coffer and will count towards the Frozen Treasures Resource.
This can be donated to your Stronghold's Coffer and will count towards the Frozen Treasures Resource.
No Level Requirement