疯了吧！你真是御兽师？ (Associated Names)

This is a world where mountains, rivers, vegetation, animals, machinery, undead, elements… can all become war beasts. This is a world dominated by beastmasters. The swaying star dragon bird above the nine heavens. A lightning elf wielding a long whip in a thundercloud. The giant whales of the vast seas are entrenched in the mountains…