With a deafening roar, Jia Lan deeply felt the violent vibration of the ground rocks, as if the rats were hit by a meteorite and fled in all directions.

  In the bloody rain, many giant rats fell into the abyss below the spiral staircase with shrill screams.

  Jia Lan was surprised to see that although there are differences between "fighting spirit" and "battle spirit", their essence is highly similar, except that fighting spirit is more direct and violent, relying solely on elemental explosion to enhance the intensity of attack.

  The operating principles of many things in this era have surpassed Jia Lan's cognition of the essence of the world.

  For example, the "arcane secret system" of the previous civilization and the "elemental magic system" evolved from the "elemental sub-school", as well as the "elemental fighting spirit" derived from the "battle spirit system" of the previous civilization but unique, all reflect this point.

  From a certain perspective, although the various power systems of the current era are not as profound and heavy as the power systems of the previous civilization in terms of depth, they are not inferior in terms of combat power strength, and even surpass them in terms of destructive power.

  This is true for both magic and fighting spirit, which may indicate an evolutionary trend of "simplifying the complex".

  Jia Lan sighed inwardly, while Captain Kenmet showed amazing explosive power with the strength of a gold-level great swordsman. He successfully blocked the surging rats on the spiral staircase alone.

  Kenmet was like a human meat grinder, exerting basic swordsmanship such as horizontal and vertical slashes to the extreme. His whole body was shrouded in dark golden fighting spirit flames, burning hot, and even his armor and battle blades were covered by blazing flames.

  Every time he swung his sword, the blazing flames released a violent explosion effect at the moment of contact with the giant rats, smashing those thick-skinned giant rats to pieces, and the broken body parts splashed everywhere, producing a secondary splash effect. Although it could not directly kill the giant rats, it caused heavy damage to the rats.

  After observing for a while, Jia Lan frowned slightly. He seemed to have discovered a flaw in fighting spirit.

  Although the explosive killing power is amazing, its consumption is also extremely huge.

  In just a few minutes, Captain Kenmet killed 20 to 30 giant rats, but the rats that continued to emerge from the darkness did not decrease.

  In addition, two dark rats about two meters long and one dark rat over three meters long were still hovering at the edge of the range of the Yongming Light Staff, watching the rats charging forward one after another.

  Jia Lan was frightened. The intelligence of these three dark rats was obviously not low.

  They knew how to use cannon fodder to consume the enemy's strength.

  Although Captain Kenmet's fighting state did not show signs of fatigue, Jia Lan thought it was not appropriate to continue. Once Captain Kenmet's fighting power was exhausted, when the dark rats launched an attack, it would pose a serious threat to the expedition team.

  Just as Jia Lan was about to attack, Captain Kenmet suddenly shouted loudly, and the silver swordsman squad behind him rushed forward quickly. Captain Kenmet took the opportunity to retreat to the rear from the gap they left, and the silver swordsman squad blocked the giant rats again.

  In the fierce battle, the 'gold-level shooter' and the 'gold-level thief' seemed quite calm. They stood leisurely in the rear and seemed to be unconcerned about the progress of the battle.

  Just as Jia Lan was puzzled, Old Jimmy seemed to see through his confusion and smiled easily: "Don't worry, this is a normal recovery link in the battle rhythm..."

  After Old Jimmy's explanation, Jia Lan suddenly realized.

  In this era, the explosive power of fighting spirit is strong and the consumption is huge. Therefore, the warriors often form a tacit cooperation in battle.

  After a round of outbreak, even if the combat power is not overdrawn, they will frequently exchange offense and defense and retreat to the rear to recover in order to prolong the duration of the battle.

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  This is just the battle coordination between the squads.

  If they are in a real battlefield, when a certain number of warriors form enough batches, they can charge in the strongest burst state like waves, destroying the enemy's defense line with overwhelming force!

  Jia Lan couldn't help but marvel at it. This is undoubtedly due to the difference in the times.

  In his time, the proud warriors would not adopt this relay tactic.

  It's not that "battle spirit" is inferior to "fighting spirit", but the two are completely different in the nature of power, and it is difficult to simply judge the pros and cons.

  Although fighting spirit consumes a lot, the recovery speed is also quite fast.

  After a short recovery, the warriors can recover to the peak state of combat power and maintain combat effectiveness for a long time.

  At this time, Jia Lan has taken out the wind-type primary magician wand seized from the Storm Wolf Mercenary Group.

  After his transformation, this primary magic wand has been engraved with a variety of magic models, waiting for actual combat testing...

  Kenmet is a gold junior greatsword master, so he did not consume too much fighting spirit in the battle just now.

  He has not even used the powerful "fighting spirit skills".

  Therefore, after retreating to the rear according to the team's coordinated battle rhythm, he focused his attention on the three dark magic rats curled up in the rear while recovering his breath.

  Rodents such as giant rats and dark magic rats are the most common species in underground ruins.

  This is not the first time he has encountered them in his mercenary career.

  Although it was quite unexpected to encounter such a monster in the dungeon of Doom Castle, Kenmet was not overly worried.

  Behind him was the dungeon stairs. If it was really difficult to resist, they could exit the dungeon at any time, guard the exit, and summon team members to encircle and suppress it.

  Therefore, while commanding the battle, Kenmet was puzzled by the appearance of dark magic rats in the dungeon of Doom Castle.

  This kind of dark creature usually appears in extremely dangerous underground ruins and rarely appears near the surface.

  Although this dungeon is unusually deep, it is not the normal activity area of ??the dark rats.

  Moreover, although there are horror legends about the Castle of Doom, no monsters have ever appeared.

  Many adventure teams have explored this place in history, but none of them found anything unusual.

  How could those adventure teams not find the existence of the dark rats! So, these dark rats and the weird flying head barbarian have only appeared here recently?

  Just as Kenmet was puzzled, a group of giant rats gathered on the spiral staircase again.

  Kenmet shook his head and waved the two-handed sword in his hand, intending to launch another tactical outbreak.

  At this moment, the dark rats under the spiral staircase suddenly let out a sharp whistle.

  After a momentary pause, the entire group of rats seemed to be in a frenzy, screaming in unison and charging at the people on the spiral staircase!

  Everyone was shocked. A large number of giant rats were climbing up the hanging wall of the spiral staircase... The narrow spiral staircase could no longer stop them!

  No one expected that such a large group of giant rats would be hidden in this inconspicuous dungeon of the Castle of Doom.

  Is there a rat kingdom down there?

  The three dark rats also began to charge with screams. They used their huge bodies to knock down smaller rats, and even trampled on them directly... Like a bull plowing the field, they directly pushed a large number of their own kind off the spiral staircase!

  Seeing the rats screaming and falling like ripe fruits, Kenmet had a bad feeling. He raised his battle blade and shouted, "Back off! Back off quickly..."

  Before Kenmet's order was delivered, he sensed a strong fire element fluctuation suddenly erupted in the narrow space between the spiral staircases.

  Kenmet turned back in surprise, but witnessed a scene that he would never forget!

  Surrounded by his men - the 'Golden Grade Shooter', the 'Golden Grade Thief', and the old mercenary of the Iguana Fang Mercenary Group, the young magician who was protected in the back gently raised his wand.

  A ball of fire spun and expanded rapidly, and in the blink of an eye it expanded from the size of a fist to the size of a round table!

  Kenmet suddenly felt his legs go weak. As the leader of a large gold-level mercenary group, he was no stranger to magicians.

  Although he had heard from his uncle that this mysterious young magician was quite "powerful", that kind of power only stayed at the level of pharmacy and alchemy.

  Kenmet thought that this young magician who always wore a level 1 apprentice magic robe, even if he was gifted in magic attainments, would not exceed the level of a junior magician.

  After all, people have limited energy and it is difficult to be good at multiple fields at the same time.

  The abilities demonstrated by this young magician have spanned the three major fields of pharmacy, alchemy and enchantment. It is hard to imagine how strong he would be in magic combat.

  However, the facts told Kenmet that the world of geniuses should not be easily speculated... You can never figure out their limits!

  What level of magic should that seemingly dangerous giant fireball be classified as?

  Is Jia Lan planning to blow up this dungeon?

  Even if he wants to blow up the dungeon, he should wait for everyone to leave first, right?

  After the round table-sized fireball expanded to its limit, it suddenly shrank.

  Kenmet and others were shocked, thinking that the magic was out of control and was about to explode before it was released!

  But after shrinking, the giant fireball suddenly expanded again and broke into nearly a hundred fist-sized orange-red fireballs.

  Under the stunned gaze of everyone, these small fireballs emitted astonishingly high temperatures and slowly fell down to the spiral staircase!

  "Boom! Boom! Boom! Boom!"