Summon Heroes

There are several kinds of Summon:
Zeal Summon - its normal summon, but you need to spend Zeals. Zeals you can receive only from friends or from events. Heroes are here from 2 star to 5 star.
 * Violet Summon - its most common summon and you can receive heroes from 1 star to 5 star
 * Gold Summon - its premium summon, where you have highest chance of receiving 5 star hero from this 3 options. You can receive heroes from 3 star to 5 star. You can receive one Gold Summon ticket for free once per 48 hours. You can buy them too in Summon heroes, each one for 250 gems or for some promo sale you can buy them in Market.

Energy summon
To receive 5 star hero there is another option. For every Golden Summon, you charge summon energy by 10 points. If you are cast 100 golden summons (you reach 1000 points), than you must be lvl 55 or VIP3 to unlock energy summon.