Dark clouds filled the sky as if a rainstorm was about to happen.

Merlin sat in a quiet room. He had already let Darknight and Lady Phillie guard the surroundings to notify him if anything happened. After all, in this unfamiliar Dara City, Merlin still had to be careful.

"Swoosh."

A Thunder Stone appeared in Merlin's hand. It was the treasure that he had obtained during the auction. Perhaps to others, it was only an alchemy material but if Merlin wanted to cultivate Thunder Fury fused with a Pandora Demon Ability, he needed the Thunder Stone.

Merlin was already very familiar with cultivating Pandora Demon Abilities. Since he did not have any Thunder-type Pandora Demon Abilities, he could cultivate it smoothly. Merlin first followed the procedures of the new spell and drew some patterns on his arm. When these mysterious patterns were drawn, they faintly modeled with the Thunder-type spells in his body, establishing an extraordinary connection.

This was the foundation for cultivating Thunder-type Pandora Demon Abilities, followed by the Thunder Stone. Merlin lightly placed the Thunder Stone on the mysterious pattern on his arm.

"Hum."

Suddenly, a glint of lightning flashed, and a faint numbing feeling spread through his arm at the same time. The fist-sized Thunder Stone gradually melted and entered the patterns. The originally bleak patterns then slowly became dazzling.

"Whoosh!"

The Thunder Stone shook slightly and quickly turned into a pool of golden liquid, and flowed into the patterns on his arm. Suddenly, some apparitions appeared on the patterns, which quickly floated to mid-air.

Those patterns were still flashing with faint lightning, exuding a terrifying aura. Even Merlin felt that it was quite brutal.

"That's it? This is the first form of Thunder Fury?"

Merlin hesitated. Although he had followed all the steps to cultivate Thunder Fury, he still felt somewhat doubtful in his heart.

"Thunder Fury!"

Immediately, Merlin cast Thunder Fury which he had just cultivated. It appeared as a Thunder-type spell with a fused Pandora Demon Ability. The only Fifth-level spells Merlin had not constructed were Ice-type and Thunder-type spells. Thus, he could only cast a Fourth-level Thunder-type spell for Thunder Fury.

"Boom!"

The deafening sound of thunder rang out as if diffusing in the air, and bouts of thick lightning bolts flashed. The entire Dara City seemed to be shrouded in the terror of thunder.

"This…"

Merlin was also stunned. The effect of ordinary Fourth-level Thunder-type spells was nowhere as shocking as this one was. The only explanation was that the changes took place after fusing the Pandora Demon Ability into Thunder Fury.

However, the change was just too drastic. The entire Dara City might have been alarmed by such a loud noise.

Merlin acted quickly and stopped the spell. He already somewhat understood the power of Thunder Fury. It was a purely offensive Pandora Demon Ability. In terms of offensive power, it was much stronger than Fiery Collapse.

In addition, it was also a large-area offensive spell!

"This is only the first form of Thunder Fury. Now I can continue to cultivate the second form!"

Merlin had always relied on Fiery Collapse as his main method of attack because attacks from Fire-type spells were indeed extremely powerful. However, he now realized that compared to Thunder-type spells, especially those that were combined with Pandora Demon Abilities, Fire-type spells were still inferior.

Of course, it might be because Merlin's Fiery Collapse was only forcefully fused into a Fire-type spell.

Now, Merlin only cultivated the first form of Thunder Fury but it had a total of three forms. Merlin had constructed a Fourth-level Thunder-type spell, which met the condition to cultivate the second form.

Thus, Merlin mustered his momentum and directly cultivated Thunder Fury to its second form. A Thunder Stone no longer needed to be consumed in order to cultivate it to the second form. Since he had already absorbed too much power of the Thunder Stone earlier, he only needed to cultivate the patterns on his arm.

Those patterns were called Thunder Lines, and were the key to cultivating Thunder Fury. Merlin gathered the Thunder Elements according to the special method, which slowly floated around the Thunder Lines. Then, the Thunder Lines rapidly thickened, and its colors also gradually became darker.

"Rumble."

The Thunder Lines shook fiercely and let out a sound like gushing water, and carved into Merlin's skin the next moment. Merlin then felt that his control of Thunder Elements increased and that he was more familiar with Thunder Fury.

"The second stage of Thunder Fury!"

Merlin finally breathed out a sigh. With the second stage of Thunder Fury, its power had increased again. Its might had now clearly surpassed Fiery Collapse, the Fire-type spell that had been fused.

Then, Merlin held out his hands, and a ball of fire and a streak of lightning and thunder immediately appeared on his left and right hand respectively. They were the Fire-type and Thunder-type spells.

Merlin somehow felt that these two spells were harmonious with each other. This type of feeling was extremely unique as if the fusion of thunder and fire could explode into a formidable force.

"Fusion?"

This happened naturally, and even Merlin felt that it was very odd. Then, he combined a sliver of thunder and fire, forming a Thunder Flame.

Thunder Flame could increase power several times over in an instant as flame and thunder melded and bound mutually.

"Bang!"

However, before Merlin could rejoice, the powerful Thunder Flame formed by the thunder and fire exploded in a flash. Flames splattered everywhere, and bolts of lightning scattered in all directions like snakes, forming several large pits on the ground.

Merlin lightly frowned. He held his chin and muttered to himself. He looked like a Ninth-level Spell Caster attempting to fuse spells. He held some similarities to Great Wizards.

However, the spells a Great Wizard would fuse would be Spell Models, and the power of those fused spells would be absolutely terrifying.

Merlin's thunder and fire was just a fusion between spells, not Spell Models. Even so, the power of the spell would explode after fusion.

However, since it was the first fusion, it exploded because it was unstable. This proved that fusing spells were not simple. One would need to try time and time again to find the compatibility, only then would the fusion be successful. The current Merlin did not seem to have this capability.

After cultivating Thunder Fury, Merlin wanted to continue cultivating another Ice-type fusion Pandora Demon Ability called Binding Ice. As the name implied, this Pandora Demon Ability was to enhance the binding ability of Ice-type spells.

Furthermore, this Fusion Pandora Demon Ability had three forms, and its power was also extremely strong. Merlin had already obtained the frigid ice bone marrow from the action, and could immediately cultivate Binding Ice.

Merlin had faint anticipation of the successful cultivation of Binding Ice. He wanted to see if Binding Ice could be "fused" with another spell like the Thunder-type Pandora Demon Ability.

Merlin was keenly aware that this was closely related to whether he could become a Great Wizard in the future.

Thus, Merlin took out the frigid ice bone marrow. Immediately, a layer of ice crystals formed rapidly in his hands, causing his hands to shiver fiercely. A layer of pale white flames quickly rose and melted the ice crystals.

Merlin took a deep breath and merged the frigid ice bone marrow into the mysterious Binding Ice runes he prepared beforehand. Then, Merlin waited expectantly...