According to community guides and official wiki data , certain monsters are considered essential for late-game success:
: Monsters can be evolved in the Summoning Chamber to reach more powerful forms. Upgrading past level 400 requires Power Stones , a premium currency that is essential for reaching the current level cap of 500. Summoner’s Greed – Idle TD
: You must position your monsters and towers to effectively block the King's elite army, including mages, knights, and lumberjacks. According to community guides and official wiki data