Guild raids are a function found in guilds.
Guild raid bosses are akin to Marauders in that the enemy heroes have extremely large HP pools, but normal values of attack that would be expected of each hero's level.
Each battle against the raid boss is rewarded with a small amount of Gold and Guild Coins. There is a 16 hour cooldown time in between battles during which guild members can pay Gems to "revive" their team and battle again for at most 3 more times at a price of 0, 40, and 80 gems respectively.
When the guild raid boss is defeated,
- guild members receive rewards based on their ranking of damage dealt
- the player who lands the finishing blow on the boss is also given a kill reward in addition to the ranking rewards
- the next guild raid boss is unlocked
To prevent guild raid farming abuse (i.e. creating new guilds solely for the purpose of repeatedly farming guild raid bosses), the rewards for finishing any boss raid of a specific level can only be received once no matter what guild you are in.