"With an equal contract, both sides hold half the rope. Now that your subordinate has reached Legendary level, she's gained the power to tug at the contract you signed with her."
"But since your strength outclasses hers—or maybe she doesn't want to challenge you—she's let go of the tug-of-war over the contract."
"Hulk, think about it. Have you ever seen me, Leonidas, or Alexander enslave an Arch Lord?"
Reading this, Orion's expression darkened slightly.
"Under normal circumstances, enslaving someone a rank below you is almost foolproof."
"Even if you're injured or something unexpected happens, it's rare for a slave to rebel and turn on their master."
"But enslaving someone of the same rank? That's a huge risk."
"So, Hulk, until you hit Arch Lord yourself, keep the number of Legendary-level fighters under you to five or fewer."
"And that's assuming they're all lower-tier Legendary."