A huge machine

Hugo circled the metallic object. He stealthily approached the six mzukas that appeared to be guarding the structure. The aliens moved in groups of two, patrolling the space around the structure. He felt no fear since he was certain that creatures at the level of a mystic knight and below wouldn't be able to pierce through his invisibility.

He made quick work of the aliens and knocked them out one group at a time using his rank-2 dark-hypnosis spell. Only the knights reacted to the spells before they took effect, but were nonetheless unable to avoid them. The wizards remained completely ignorant until the spells hit them. He did not stop at putting them to sleep, but also ended their lives soon after. He didn't want to leave any threats behind that could stab him in the back later on.