Naturally, the Frost Dragon wouldn't just let him go, but in the face of Qi Lin, who was like a rat in the hole, it didn't have any good way.

The Frost Dragon's front paws were sharp on the front of its wings, but it couldn't exert its full strength, so it raised its upper body and climbed the front paws of its wings to the edge of the auditorium, and began to dig into the walls of the Colosseum with its more developed and robust hind limbs.

Every time a claw larger than an excavator's bucket fell, it brought up a spark and an unbearable noise, and the metal shell of the interior wall was quickly gouged out with a large hole, revealing the load-bearing skeleton inside.

The metal part of the Colosseum's structure naturally couldn't be solid, but the thickness of the shell was at least seven or eight centimeters thick, and the armor used as power armor was more than enough, but in front of the frost dragon, it couldn't hold out for even five minutes.

The first metal interior wall was quickly dug open by the Frost Dragon...... However, this was only the first layer, there were still more than fifty meters from the depths of the tunnel where Qi Lin was, and in order to catch Qi Lin, the Frost Dragon had to dig through all these fifty meters.

The injuries inflicted by the six-winged albino bat on the Frost Dragon were still there, and Qi Lin noticed that the Frost Dragon had been digging with its left leg, and when its left leg was raised, the injured right leg would tremble slightly.

The Frost Dragon's body is so large and naturally heavy, and its legs need to carry a lot of loads......

If it weren't for the support provided by its front paws on the guardrail of the auditorium, I am afraid that the injured right leg alone would not be able to carry the weight of its whole body.

Thinking of this, Qi Lin immediately took out the Gauss sniper rifle, aimed it at the right leg of the Frost Dragon, grabbed the moment when it raised its leg to exert force, and shot it out several times in a row!

Although the electromagnetic bomb could not penetrate the surface of the Frost Dragon's body, the huge kinetic energy attached to the warhead caused the Frost Dragon to lose its balance in an instant, and its heavy body slammed to the side, crushing a large area of the audience.

Draining the Frost Dragon's stamina and patience as much as possible was one of Qi Lin's strategies.

Struggling to its feet again, the Frost Dragon suddenly sped up its digging speed - it was clear that Qi Lin had angered it once again.

Several more streamers shot out of the tunnel, only this time, the Frost Dragon's front paws found two more solid fulcrums, and the electromagnetic bombardment landed on its right leg, only causing it to stagger a little, but failing to knock it out again.

The Frost Dragon let out a roar of rage, kicked its hind limbs, and directly kicked a basin-sized piece of gravel into the tunnel, Qi Lin hurriedly dodged, and the gravel flew straight into the depths of the tunnel, making a huge collision sound.

The Frost Dragon only uses physical attacks, so Qi Lin is not worried about what it can do, if it is replaced by a King Blood Dragon Lizard, I am afraid that it only needs one dragon breath bomb, and this entire tunnel will become purgatory.

The Frost Dragon was still destroying the walls of the Colosseum, and even the auditorium above the walls was shattered by the Ice Dragon's front paws, and it seemed to have vented all its anger on the building, but unfortunately, due to the special structure of the Colosseum, it was too difficult for the Frost Dragon to touch Qi Lin......

In addition, the various rooms inside the Colosseum are connected by tunnels, even if this end is dug through by the Frost Dragon, Qi Lin only needs to move his position slightly, and the Frost Dragon's previous efforts are all in vain - as long as the entire Colosseum has not been completely dug up, then Qi Lin will always be able to find a safe place to hide.

It's just that here's the ...... Although the Frost Dragon had nothing to do with Qi Lin for a while, Qi Lin was also helpless against the Frost Dragon. Although the "indestructible" attribute entry has been deleted by the mastermind, the defense coefficient of up to eight nines is still an unattainable astronomical number - originally Qi Lin had no specific concept of this defense coefficient similar to the attribute of online games, but after the mastermind told him that the maximum defense coefficient of the "Mjolnir" energy shield was only more than 30,000 points, he understood that this change was basically no different from no change.

After reloading the Gauss sniper rifle in a hurry, Qi Lin fired a few more shots at the Frost Dragon's right leg, but after eating it once, the Frost Dragon had learned to be clever and would not lift his leg at all without standing firm, although the progress of the excavation was slightly delayed, but Qi Lin could no longer find a chance to knock it down.

"Are you sure you want to keep going?" The Mastermind suddenly asked.

"But the problem is that I haven't thought of a more feasible plan yet......

"Although I have no objection to your plan, I can show you some data-" As he spoke, a projection panel appeared in front of Qi Lin, on which two things similar to progress bars appeared.

The first is the physical consumption of the Frost Dragon, after nearly half an hour of excavation, the Frost Dragon's physical strength consumption is less than 0.1%, according to this conversion ratio, as long as there is enough time, it can completely dig up the entire Colosseum, and the physical strength consumed will not even exceed one-third.

The second is the progress of the Frost Dragon's injury recovery, the current value has reached 32%, and it is still rising, and after the Frost Dragon's injury recovers, Qi Lin wants to find an opportunity to kill it, it will be even more difficult - there is no second six-winged albino bat to be found here.

"In other words, I don't really have much time left, right?" It could take a month for the Frost Dragon to dig down the entire Colosseum, but it would take less than a day to recover from its injuries, and Qi Lin could indeed drag it out, but the further back it went, the more difficult the game would be.

The Frost Dragon's claws continued to dig deep into the building, and the loud noises similar to those of the old construction sites echoed through the Colosseum with occasional roars, but Qi Lin sat down in a lounge and entered a state of closed eyes and contemplation.

What to do...... What kind of plan should be taken to get close to the Frost Dragon and deliver that portable nuclear bomb into its body?

The portable nuclear bomb is Qi Lin's only means of killing the Frost Dragon, and this means of killing has a premise, it must be detonated in the body of the Frost Dragon, Qi Lin did not think of disguising the nuclear bomb as a bait to trick the Frost Dragon into swallowing it, but the mastermind told him that there is a corrosive secretion in the digestive tract of the Frost Dragon, which can easily destroy the detonation device of the nuclear bomb.

Moreover, in addition to having extremely high defensive power, the body surface of the Frost Dragon can also block electromagnetic waves, and it is impossible to detonate a nuclear bomb by remote control, it can only be detonated at a regular time, but the timing of the scheduled detonation is very difficult to grasp - from the Frost Dragon swallowing the nuclear bomb to the destruction of the detonation device by digestive secretions, there is only a few seconds before and after, and this gap is too difficult to grasp.

"So...... In addition to the digestive tract...... It's just chrysanthemums, right? Qi Lin couldn't help but think of the experience of putting nitroglycerin bombs into the birth canal of the mother Assasin spider in the "Wasteland Survival Code", thus killing the mother Assasin spider...... It's just that between the Frost Dragon and the Assasin Spider Mother, this gap can no longer be described by the word chasm, if it was so easy to get, Qi Lin would have already put it into action.