> For the complete documentation index, see [llms.txt](https://docs.heroestd.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.heroestd.io/gameplay/quest-system/main-quest.md).

# Main Quest

The large quest chain will play an important role in collecting materials to upgrade the power of heroes. The big quest begins to activate as soon as the player starts playing HeroesTD for the first time.