Wu Ling chose the Void Equipment Set, which gave him Void Power. Void Power nullified most attacks and could cause his body to vanish, which would allow him to carry out dangerous assassinations.
Wu Qing chose the Light Equipment Set, which had some Light element skills. One would think that Light element skills did not suit an Assassin, but they could be used to bend light, reflect light, and scatter light, aiding one’s assassination skills, and it could even be used for healing.
Yue Zhongchang chose the Terror Equipment Set, which had a mental-type legacy, and its skills were used to strike fear into enemies during the day and terror at night, making it so that they could not sleep. This would slowly torture and torment the enemy, making it easier to assassinate them.