The character that Wei Huo was controlling was fighting with the Frost Dragon. The physical quality of a Level-200 player was about the same as an Epic-ranked player's. However, no matter what, it was impossible for him to fight a Legendary creature. It would not work even if he had a Legendary weapon.
However, Wei Huo had already reached the Legendary stage. His avatar was also at the Legendary stage. That was enough for him to resist the Legendary domain. At the same time, he could also unleash Legendary combat power.
Besides, the Frost Dragon in front of him was only at the Legendary stage created by the system.
A player's eyes could also see the Frost Dragon's attributes. After the Frost Dragon fought with Wei Huo for a bit, its MP decreased by one-fifth.