How to exchange for your tower coins?

During the current special dungeon event, we will be receiving shards upon clearing zone 1st,5th,10th and 15th. Magic tower gives you Magic shard and keystone tower give you Keystone Shards.

-At 1st zone, you will receievd 1 piece of shard.
-At 5th zone, you will recieved 1 piece of shard.(Unlimited amount of times)
-At 10th zone, you will recieved 2 piece of shard.(Unlimited amount of times)
-At 15th zone, you will recieved 3 piece of shard.(Unlimited amount of times)

To exchange for the coins;click the special dungeon banners and you will reach below screen.

Click on the Tower coin Exchange>> and you will be brought to the another screen as below:

If you have enough shards, you will be given the option to exchange.Once you exchanged, you will reach the final screen below, telling how many tower pacts available.

Hurry collect as many as you can, then combine it to give you towers coin which promise UC and above Familiar.