Combine all 4 parts of the pyramid to get the powerful Pharaoh's Treasure spell. You should play 5 days in a row to get one part of the pyramid. Don't break off the chain as the chain will be reset to zero or you will have to spend crystals to restore the chain.
Every day you collect the parts you get a daily reward
NOTE: You need to visit the game in 24 hours not to break the daily chain.
1st day - 400 gold
2nd day - 600 food
3d day - 950 supplies
4th day - 3 Crystals
5th day - A part of the pyramid
To see the parts you have got tap Inventory icon from the city to get inside. Switch 'Spells' tab.
You can use this powerful spell from your Inventory when you assemble all the parts. The effect of the Pharaoh's Treasure lasts 1 day (24 hours).
NOTE: The spell is active even if you are not playing the game.