In the biological world, bright, vivid colors were generally warning colors.
And the dark red patterns on the door might actually have been a warning color, so it was better to be careful.
Since arriving in the Underground Space, this was the first time they had encountered patterns on a dark red door. Mental Power had just failed to detect whether there was poison, and it also gave no sense of danger. But Mental Power perception was truly unreliable at times, so caution was still best.
As for sending the mercenaries in, the intention was naturally to have them test it out. There were four of them mainly because the door itself was huge and made of metal, making it extremely heavy. Without enough strength, they really would not be able to push it open.
After receiving Tina's order, Tra immediately gave the command for four mercenaries to step forward and prepare to push open the door.
These four were among the most powerfully built fellows in the mercenary group, looking like bears overall. People like them were basically used as heavy weapons operators among mercenaries, usually handling machine guns or other heavy weapons. Their main advantage was their strength.
Tra had selected these four because the door looked quite heavy. Ordinary mercenaries might not have enough strength and would only lose face if they went up, so he had the four heavy weapons operators exert themselves together.
Since entering the Underground Space, they had encountered doors made of iron, bronze, stone, even gold and gold-plated materials, but every door panel had one thing in common: they were fucking heavy!
So if the four of them could not push it open later, they might have to add more people.
Even Ability Users sometimes struggled when opening certain doors. The one