I passed stage 300. 0 hero drops. 2 star: !P2W! Earn 99 gems daily. The 5 NEEDED extra battalions (bats) are bought w/ gem (last bat =965 gem). Rarer anything (1800+ gems) =better. 1500 gem =$30. The game is definitely fun with endless strategies. You have a bat (up to 6 bats), which has 9 spaces to put ANY kind of unit in. Any unit/hero combination, even duplicate. Once one bat is eliminated, the next bat jumps in to fight the current enemy's bat. You can add up to 3 relics to boost each bat.