If you disperse your resources appropriately, you can do a couple of summons every day. The Normal Summon option will let you summon heroes by utilizing Summon Tickets, which you can collect by leveling up the admiral (a.k.a. your level, that you see in the leading left) as much as level thirty. There are also the Special Summon (five *) that will let you evaluate your luck in summoning a hero of your option for paying twentyfive Summon Stones per shot. You can then select in between a seven x seven grid (fourtynine slots) by tapping on a chosen one, and if you're fortunate you can get that hero of your dreams. The Special Summon (four *) works the like the Special Summon (five *), however costs just fifteen Summon Stones per shot, and will approve you a four star hero (of the ones noted readily available there). With the Normal Summon you can either select to summon with a Summoning Ticket, or by paying thousand Diamonds per summon. That's why it's necessary to gather all the possible Diamonds in the game, due to the fact that if you are fortunate you can get an actually great five star hero from even the basic Normal Summon.