The warlock who had transplanted the bloodline of a vampire could not break the fiery tree's defense at all. Besides, the fiery tree was already a projection of the law of fire. He certainly couldn't suck any blood from it…
On the contrary, the fiery tree launched flames back at him. The flames turned into a cage, and burned this guy who reeked of the stench of blood. He would've been burnt into ashes if he hadn't been making use of the power of the rivers of blood on the battlefield…
Burning mana was absolutely useless too because the flames on the fiery tree were powered by mana to begin with. They were actually burning the warlock's mana. As more flames were burning, more of the warlock's mana was incinerated.
With the fiery tree as their support, and plus the magic crystals that Lin Yun had prepared for them, the legion mages could easily defeat a level-5 Heaven Rank expert in a war of attrition, not to mention a warlock only in level 1 of the Heaven Rank…
