Any prep tips for the up coming SAND EMPIRE?

[princess1]

Some nice advice in this thread, as well.

Need advice on summer event

Pls need advice on summer event , im now in advance stage 15 n its hard to win. Pls advice me what i need to do to win this event. My 5 heroes use are delilah,scarlett, perseus,merlin,kiril, But can’t win. I do have peter hukong, g.jackal.little jhon. Grimm. Chao. Melendro. Tiburtus. Pls need sdvice thanks