A Jinx
Harry felt happy that he didn't bring Aoi the first time and asked her to stay back. He didn't want her to vomit or faint.
Harry then felt like facepalming. Most of the soldiers had fainted. With no choice left, he had to go to the system for help.
"System, do you have anything for mass group healing?", asked Harry.
[Host, I do have it, but you need to buy it.]
Harry sighed before saying, "How much is it?"
[Host, I have another option for you too. Do you want to accept a mission, and take the healing halo, which is one of the rewards for it?]
Harry thought about it for a while and asked, "Is the halo an ability or a one time usable? And, what is the mission?"
[Mission : Conquer the four human kingdoms (Eryeth, Ikriven, Laitidel and Xanetia) taking advantage of their current lack of soldiers.