World Boss

Go to Daily Events, click on World Boss. Rules & Rewards, 'nuff said!

Devil Zu Chu: Counter attacks. Multi hitters and critical hit fiends, beware! Reverse your gear: high and critical attacks go to healers and equip damage dealing heroes with defensive/dodge gear. Use 2nd formation in case your heroes die, so you maximise dos.

Ghost Diao Chan: Poison. High defence makes poison damage negligible or use a healer.

Ghost Zhen Ji: Lowers attack.

Devil Pang Tong: Attacks everyone in party, targets hero with lowest defence stat.

Devil Zhang Fei: Attacks an entire row, starting from the middle, down. Then when that's clear: far left of your screen, down and finally to the right. If you can block or prevent him from going through your party row by row, you'll dish out more damage.

Devil Guan Yu: Regenerates, on hit atk. Hits pretty hard, but only one hit attack. Find a tank and block his path.

Devil Lu Bu: Counter attacks every single move, including archers. As per Xu Chu: multi/critical hitters beware! Use Xu Chu strategy.

Inspire Runes (found in Dungeons and Jade shop) can be used to boost your heroes' stats, and rank higher in total damage. Higher rankings equal more rewards, so make sure you only spend Inspire Runes, when the reward is a good one!