Well these chapters are lore drops of the original series ...

So first of all the five races all live in different realms (worlds) which are connected by rifts in space-time called WORMHOLES which connect realms to each other....

Then the ANCIENT RELIC is made with an fantasy alloy named TERATRIUM

The four heroes had specific classes in which they excelled they were

ELF- highly excelled at summoning magic and was a close range assassin. Weapon of choice was TWO DAGGERS made of the sharpest tooth of a dragon.He was a very secretive person he had a huge mana capacity, and deep knowledge about the world

Human-Berserker was always going berserk and never following orders. Weapon of choice was an WAR AXE.

Beastmen-Warrior Shield of the party. Weapon of choice was a KATANA. She was exceptional at magic and swordsmanship she was the second best swordsman of the party after the God. She was very proficient at high-grade Ư̸̢̨̹̭̺̘̂̊̈́̿̍̌̒̐̉̅̂̕͠Ņ̶̜̟͚͙̰̙̼͓͍̤̾̅̀̈́̒̄͛̇̍͘̚K̵̻̅̍͋̎̏̀̕͠Ņ̸̳͎̱͖̟͇͇͕̘̝͂̒̌̾̈́͜Ọ̷̘̽̔̀̚Ẅ̸̢̡̦̼͎̙̗̩̬̺͙̯͈́̇̂̊͛̋̕͠N̸͍͚̩̦̞̘͔̦͙̯̜̞͇̮̍̏̎̀̿̊̏͘͠ Magic.

God-Swordsman,Healer and magic for firepower and range. Weapon of choice was a one-handed broadsword made up of some Ư̸̢̨̹̭̺̘̂̊̈́̿̍̌̒̐̉̅̂̕͠Ņ̶̜̟͚͙̰̙̼͓͍̤̾̅̀̈́̒̄͛̇̍͘̚K̵̻̅̍͋̎̏̀̕͠Ņ̸̳͎̱͖̟͇͇͕̘̝͂̒̌̾̈́͜Ọ̷̘̽̔̀̚Ẅ̸̢̡̦̼͎̙̗̩̬̺͙̯͈́̇̂̊͛̋̕͠N̸͍͚̩̦̞̘͔̦͙̯̜̞͇̮̍̏̎̀̿̊̏͘͠ metal. He joked a lot and was very normal looking ,but his fighting prowess were exceptional he could take on entire armies alone.