While experimenting, Du You also compared his other skills. He already had quite a few large-scale skills.
Destruction Flames need not be mentioned; as a Super Tier Skill, its power is truly terrifying, unmatched by any other skill.
Devouring Swamp, on the other hand, is a large-scale environmental type skill with strong binding abilities. Its most important effect is to change the terrain, creating trouble for enemies or entangling them.
However, against opponents of the same tier, this skill is not very effective.
The Hellfire Spider is similar, a trap type skill that also has little effect on peers of the same tier.
But the Dark Flame Arrow Array is different; this skill overlaps too heavily in its wide-area usage with the Shadow Spirit Light Ball.