Ao Shen hurriedly healed his injuries, ensuring he reached his peak state as soon as possible. And the price for his action was the death and severe injuries of many of the troops in his Demonic Legion.
Previously, the legion was already injured after they offered their Bloodline Source to Ao Shen. But now, after giving him their life force, many people died. If it were not for the fact the demon race had a naturally powerful physical body and higher life force than races like humans, more people would have died.
Despite this severe sacrifice, 99% of these demons were willing. Before participating in this battle, they prepared for their death. Ao Shen and the other tribe chiefs trained them with the idea that the human might besiege them as soon as the battle began.