Lan Qinghua was burning his Essence Blood. Given his age and condition, this was an act of desperation. Burning Essence Blood caused immense self-harm, potentially stunting one's Cultivation and even shortening one's lifespan.
Yet he still chose this path. The primary reason was the immense pressure he was under from the Tu Family. Compounded by his unavenged son's death, his inner fury finally erupted. By burning his Essence Blood, his strength would soar. As long as he could kill Lin Xuan, he would obtain the Five-Colored Lotus and the Coiling Dragon Ginseng.
With those treasures, he could not only recover his lost Essence Blood but even advance his Cultivation. If he didn't stop Lin Xuan now, he would lose his chance forever once Lin Xuan returned to Divine Martial Island. His only other option would be to launch an all-out assault on Divine Martial Island. While a tempting idea, it would be a tragic waste if they conquered it only to find nothing.
