Summon circle is the main channel to get servants. According to the categories, summon circle can be divided into silver circle and golden circle.
The prizes of drawing the circles as below:
Silver circle : cost 10000 golds. It would be a probability to get the servants, normal equipment and the primary experience book.
Golden circle: cost 288 diamonds. It would be a probability to get the powerful servants, advanced equipment and intermediate experience book.
10-draw can get 10% off. Players can get the rare servants from the Golden circle.
Players can draw for free in sliver circle for 5 times per day and draw for free in Golden circle for 1 times every two days. In order to collect all your favorite servants, golden circle and sliver circle are the part of daily tasks you need to do per day.