Ok so I seen this game as an offer in tapjoy to earn a lot in game currency if I completed a task. The offer stated to open two void shards within 10 days. At first glance it look like you would have to spend money to complete the task on time. However, I notice that they had a referral program that offer the void shards that I was needing. So, I invited 2 friends and with 1 day left on the offer I summoned 2 heroes from the void, but they refused to pay out the reward. I don't recommend playing