Transmigrated as a Ghost

As the colossal robot armed to the teeth approached, every member of the expedition squad that was in any shape to attack prepared.

Thankfully they had a few seconds of forewarning thanks to Miguel's summoned beast being able to see farther through the fog than any of them.

Unlike any of the other creatures they had encountered on this island, the robots did not seem to have the boon to see through the fog more easily than outsiders. So far, they had only begun attacking once within three hundred meters.

On Miguel's signal, everyone that had been prepared to strike unleashed their attacks towards the looming threat. None of them wanted to face the colossal robot in a fair fight and were hoping to take it down before it even spotted them.

'Phoenix Fire.'

Summoning up practically all of the mana left in him, Marcus cast a tier seven fire magic spell and launched it in the direction Miguel had said the robot was approaching from.

Along with him other powerful spells went flying and those that focused on martial weapons unleashed flying mana attacks weapons.

Finally, the last to attack was Fianna, her arrows would fly faster than any other attack and she timed it so that they would hit at the same time as the spells and mana attacks.

'It won't be enough.' Marcus thought. He could instinctually tell that their barrage of attacks lacked the power to bring down the enemy Miguel had described to all of them.

Yet, what truly happened was far from even the worst-case scenario Marcus had anticipated.

By the time the attacks should have hit when the robot was only around four hundred meters away, Miguel's face grew pale, and he stared off into the distance with a look of disbelief.

"Miguel, what happened? Is the robot still standing? Did it at least take some serious damage?" Mrazivý said, still taking her place as leader of their party and asking for an update from Miguel who was just standing there stunned.

Shaking his head, Miguel regained some of his composure and quickly told them all what his summon had seen.

"Almost none of the attack connected. Some sort of field around it disrupted the spells and mana attacks and lessened their power to basically nothing. Fianna's arrows hit but did practically no damage to its thick armor. We can't stay here any longer. There is no way we can block its attacks in our current condition." 

After Miguel gave his report, he abruptly turned around and jumped down from the wall. Now that he had warned the others about what had happened, he decided to protect his own life above everything else. He was not going to stay up on top of the wall and leave himself open to being showered in gunfire.

For just one instance, everyone stared stupefied at Miguel's figure that landed on the ground on the side of the wall that was away from the incoming colossal robot. 

Then, the leaders of the expedition squad ordered a retreat and urged everyone to follow Miguel. 

While they had fought a painstaking battle to claim this wall, staying would only see them obliterated by explosives and bullets. Better to put the massive wall between them and the colossal robot coming their way.

Marcus chose to be one of the last to jump and looked behind him just as the colossal robot crested the edge of the fog.

The moment it spotted its targets, the thousands of guns all over its body came to life and several panels on its body opened up to reveal a cache of rockets. Within this one colossal robot was the same firepower as every other robot they had fought combined.

Without any hesitation Marcus leapt from the top of the wall right before the barrage of pullets and rockets were launched.

As he fell, he knew that his current exhausted mana pool was not going to be sufficient and used his Supreme Skill Ultimate Refresh to bring his status back up to its peak condition.

All at once he was completely revitalized and capable of fighting at his best once again.

When his feet finally touched the ground, he heard a thunderous roar as tens of thousands of bullets impacted the wall of the stronghold.

Thankfully the sturdy wall held through the initial barrage of bullets, but the incoming rockets were another story.

A great fiery ball erupted from the other side of the wall and parts of the stronghold began to buckle under the immense explosive power.

Unlike the bullets that could only fly in a straight line, some of the rockets flew over the wall and began raining down on the expedition squad.

Everyone still in fighting shape either dodged or used defensive magic and skills to protect themselves and their comrades. Unfortunately, this slowed down their retreat.

'We are going to suffer casualties at this rate. I really didn't want to use this spell since it uses so much mana and I haven't truly perfected it yet, but we need a defensible position that can take a beating.'

Steeling his resolve, Marcus turned around and slammed both his hands into the ground. 

Mana erupted from his body at a speed so great that he began to violently glow as he cast his strongest defensive spell.

"Castle Ferrous."

The tier eight iron magic spell immediately went to work, and a gigantic structure of pure iron began forming around Marcus.

In only a few dozen seconds a miniature version of Borealia's Royal Castle had surrounded Marcus and the rest of the expedition squad.

Not long after its creation the castle was bombarded with rockets.

However, even under the barrage of heavy explosives the iron castle stood strong and protected all those that were within it.

'But will it be enough once that robot blasts through its own stronghold?' Marcus thought, racking his brain for what to do next.

He had offered them temporary shelter, though with a few of their members practically out of commission and almost everyone already exhausted, their chances of a successful counterattack seemed slim. Even just trying to run away without losing anyone did not seem possible with explosive rockets raining down upon them.