Liu Zhenhan thought back to his encounter with the fallen elves in the Ink Crystal Valley, who used another offbeat magic - Dark Magic. There were many mages among them, but beyond creating clouds of "Deep Dark Fog", they could only summon undead creatures and lacked variety in their spells, certainly not as versatile as human magicians who kept diversifying their magic techniques.
As for that Hell Black Dragon, who knows how they conjured it up.
Adding Xiao Cui's mention of Demonic Fire and Levitation Technique, this Dark Magic of the Drow Elves seemed similar to the Shamans who possess magical creatures, and somewhat like the Soul Wanderers. A weird mix of everything, yet resembling nothing.
Liu Zhenhan gradually sorted out his thoughts; the unconventional magic of the fallen elves, though easy to learn and seemingly numerous, had a significant irreparable flaw - it was difficult to develop on a deep level.