Yang Qi had subdued four deadly monsters.

However, their oaths would only temporarily bind them. There was no way creatures like them would ever willingly serve a human, thus it was only a matter of time before they went back on their word. Monsters in general couldn’t be trusted, at least, not unless he summoned them via his Hell Portals.

Unfortunately, Yang Qi could not yet summon nightmarish experts such as them.

His current limit was Chaos God fiend-devils. And even with the Chaos Gods, he couldn’t summon any fiend-devil that had progressed past the third or fourth minor stair. The four suzerains were so far beyond that level that their auras already resembled that of the Deathless Heavenly Stairway. So it was obvious that Yang Qi couldn’t summon them through his Hell Portals.

He would have to wait until he reached a higher level for that.

Perhaps when he reached the next level, he would even be able to summon fallen...