Castle of Black Iron

Over 3,000 large airships were 40 miles in length and 12 miles in width. The three large formations from 5,000 m high to 10,000 m high were like an eye-catching large cloud if someone watched it on the earth.

If it was not blocked by clouds, anyone could see such a giant slowly moving in the sky from hundreds of miles away. It was not difficult for demon knights to discover them because demon knights had much greater vision and senses than commoners. Those which could fly always had a good vision, not to mention wing demon knights.

As so many airships were flying in large formations, they couldn't move fast. Additionally, being affected by wind, all the airships could only move over 30 miles per hour. It was as slow as tortoise for knights.

Like how dogs liked chasing after frisbees, when wing demon knights caught sight of so many airships, they couldn't wait to bring down all the airships.

Being easily discovered; a large quantity; a great flight speed. They were the favorite targets of wing demon knights in the sky.

Previously, Zhang Tie thought this mission would be boring and peaceful; however, he soon realized that it was a profitable trip to wait for wing demon knights. He didn't even need to look for wing demon knights; instead, he only needed to escort these airships when the wing demon knights would come for him.

He was more like angling than executing the mission of convoy.

After the airship troops left Xiangshan City for 6 hours, the dark fell; Zhang Tie who was sitting on the back of the thunder hawk and reciting the endless true words of the Great Wilderness Sutra as well as having the thunder hawk fly dozens of miles around the airship troops noticed a wing demon knight.

It was not the thunder hawk who discovered the wing demon knight first but Zhang Tie; because the thunder hawk's sight could never match that of Zhang Tie's lotus-flower eyes. Additionally, that wing demon knight excelled at hiding himself. It was not flying towards the airship troops at a high altitude, but close to the woods.

It was a black iron wing demon knight who might have guessed that the airship troop was escorted by some knight-level powerhouses. However, it didn't know how many human knights were there. Therefore, it just hid somewhere far away from the airship troop and observed them carefully.

'Now that you've come, don't leave then.'

Zhang Tie knew that a black iron wing demon was nothing but sh*t for him; however, it could pose a great threat to ordinary human fighters even ordinary black iron human knights. Now that Zhang Tie had discovered the threat, he would eliminate it for sure.

Watching this wing demon knight approaching them, Zhang Tie directly had the thunder hawk fly over there.

As the thunder hawk moved at the speed which was 2 times the speed of sound, when the black iron wing demon discovered Zhang Tie, it didn't even have time to escape. Therefore, it could only fight Zhang Tie to death. However, no matter what, a black iron wing demon's struggle in front of Zhang Tie was neither meaningful nor challenging at all.

In the wild, the black iron wing demon had been knocked out and teleported into Castle of Black Iron in less than 2 minutes.

Smacking his lips, Zhang Tie flew back as he felt unsatisfied.

...

"What happened?" Long Miao, Fang Hui and Peng Yulin were sitting on the air sacs of airships. Long Miao was in the middle of the airship troop; the two corps leaders were respectively in the front and at the end of the airship troop. Zhang Tie flew around the airship troop in the periphery. The four knights formed a defense matrix to respond to the possible emergencies. As the thunder hawk moved too fast, not until the 3 people saw the battle qi smoke of the black iron wing demon knight which soon disappeared did they realize that a battle had finished. Therefore, they hurriedly flew over there.

"Nothing, just a black iron wing demon knight. I've already dealt with it!" Zhang Tie told Long Miao, Fang Hui and Peng Yulin casually.

The 3 people exchanged a glance with each other. After revealing a bitter smile, they returned to their own posts.

...

Starting from this black iron wing demon knight, this airship troop was like a piece of fishy and bloody beef which was thrown into the ocean which constantly attracted sharks. However, Zhang Tie defused all the dangers.

During this process, even Long Miao, Fang Hui and Peng Yulin didn't know how many wing demon knights had Zhang Tie killed; because starting from the first black iron wing demon knight, Zhang Tie had enlarged his flight radius from 30 miles to 60 miles. Sometimes, Zhang Tie even flew farther away to launch an attack on his own initiative in the excuse that the thunder hawk would like to chase after demons the moment it discovered them in the far in case of troubles. Therefore, wing demon knights would always be discovered by Zhang Tie and his thunder hawk from over 120 miles away.

Long Miao, Fang Hui and Peng Yulin only remembered that they saw one battle qi tornado and two battle qi smokes from over 120 miles away and over 250 miles away respectively in the last 3 days. Besides, they had not seen any demon knight being less than 60 miles away from their airship troop.

In order to not attract the attention of more human knights, demon knights who had penetrated into the territory of humans would not always release their battle qi tornadoes or battle qi smokes on their own initiative in each battle. When some demon knights found human powerhouses approaching them, they would choose to escape; therefore, Long Miao, Fang Hui and Peng Yulin estimated that Zhang Tie might have already driven away or killed at least 4 demon knights in the last 3 days, one of them should be an earth wing demon knight.

As for Zhang Tie, the achievements that he made in the last 3 days was enough for him to promote to 9 change earth realm easily; because he actually killed 3 earth wing demon knights in the last 3 days. He swept all the way from Xiangshan Prefecture to Helan Prefecture in the name of escorting the airship troop...

It was also out of Zhang Tie's imagination that he could make such a great achievement only after leaving the underground space for a few days. With one more earth wing demon knight or some more black iron wing demon knight, Zhang Tie was sure that he could promote to a shadow knight at the end of this year.

Even Zhang Tie was shocked by such a great advancing speed. 'Purgatory Samsara Method is too terrifying in such a holy war. With such a secret method, how could I not promote to a shadow knight rapidly?'

On December 28, the 904th year of the black iron calendar, Zhang Tie returned to Blackwater Base after leaving there for over 4 months as an earth knight scout like flying a kite...