Castle Treasure Dropshttps://irowiki.org/wiki/Castle_Treasure_Drops

Castles captured by guilds participating in the War of Emperium and War of Emperium 2 spawn treasure boxes each day at exactly 12:00 AM PST. The boxes spawn in a special room only accessible by the guild leader through the castle NPC. Castles in each original WoE realm have one common Treasure Box and their own individual box. Dr. Jonesy in Prontera (152, 285) will trade 150 Witch Starsands for 1 Treasure Box.

For a list of treasure drops, go here.