Although Qin Feng, after advancing to the Profound Immortal realm, is technically on the same level as Marquis Heng, he still addresses Marquis Heng as a senior rather than as a Daoist Fellow!
This is not only because Marquis Heng has existed for an exceedingly long time, much longer than the founder of his Beast Taming Sect, and calling him a senior is no loss.
More importantly, Marquis Heng's strength is immense!
He has even reached a point beyond the limits that a powerhouse of this realm can achieve, almost able to contend with Immortal Realm experts.
Although Qin Feng doesn't know how large the gap in battle strength is between Marquis Heng and an Immortal Realm Great Power, just seeing how Marquis Heng easily defeated the Netherworld Sheep Palace Master is enough for Qin Feng to realize that Marquis Heng's accumulation is terrifyingly deep, and he is likely already at the threshold of advancing to the Immortal Realm!
