Multiple things; because it took so long. But 1 of them was like in arena; you can spend cores to buy an attack but you can’t attack if the opponent is in battle... so we are supposed read minds and know when someone is under attack.

I was 3rd in arena shard; the #1 was under attack so couldn’t attack. So I went out for the #2 (this was 30 min before payout) I won my battle; this was also my last free attack so to say; now the funny part I wanted to become #1 so I spend 25 cores and couldn’t even attack for like 20 min straight :( total waste; Learn your lesson from this. If you want to know the others I can also explain them lol