For all aggresive players
here is what you need for the 5th cave of trial
Mermaid , Witch , Succubus , Centaur , Black Knight , Dragonrider
Lightningbolt , Freezetrap , Comet and Heal
stay in defensive position until all units are trained
shoot a comet into the wall of bombers and push forward nonstop
as soon as you reach the enemy castle shoot a lightning at the invincible unit
push nonstop until the first wave of enemies appear
kill them with your freeze trap then constantly hit the attack button and use comets
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