Anger
Even as Lex fell through the levels, a frown didn't leave his face. Something extremely unusual was happening on this planet, and he was caught in the middle. To a certain degree he could understand things getting out of hand. After all,a dragon had mysteriously died here, so there was one mystery entity to account for.
Then there was the group of foreigners who, through some unidentified means, discovered the dragon was dead and even spread the news. As unlikely as this was, it still remained within the realm of possibilities.
The several groups that Lex fought while looting also made sense, since the news of a dead dragon would surely bring about an endless tide of looters, pirates and cultivators hoping to find a lucky encounter.