There is a Hidden Treasure in almost all chapters of the Main Story and Time Rift levels. You can claim this treasure by having a unit under your control end their turn on the tile that contains the treasure. You must then successfully clear the map in order to keep any treasure collected.
Tips[]
The tiles containing the treasure are usually marked by a conspicuous object on the battlefield, such as these:
Some Hidden Treasure tiles are less obvious, such as the cracks in the ground or floor tiles:
You can use Move Again Skills like Strike, Chivalry, and Wind Spiral to claim the Treasure if used on the correct tile. You can also use Teleport Skills to teleport a hero onto the correct tile to claim the Treasure.
If the map is large and the Hidden Treasure is far away from where your heroes start the battle, you may want to use a hero with a Summon Skill and send the summoned unit to collect the treasure.
For specific treasure locations and reward details, please see: