There are both Seasonal Events and Challenge Events. There are currently four seasonal events, one associated with each season of the year.
- Spring / Easter: Springvale
- Summer / June: Sand Empire
- Autumn / Halloween: Return to Morlovia
- Winter / Christmas: Santa's Challenge
Each event has between three and six event heroes associated with it that you may only acquire while the seasonal event is live. They may only be acquired by Seasonal Summon. If you posses an Epic Hero Summon token, you may wish to hold onto them for use during the Seasonal Event when the Seasonal Summon replaces the Epic Hero Summon.
All Seasonal Events (except for Santa's Challenge) have 20 stages and grant particularly good rewards every 5-10 stages. Santa's Challenge consists in 24 stages, with the notable rewards every 6 stages.