Arrus Altman's role background:
Arrus Altman was very powerful, and he had the same strength as King Otto, but he died when the magma man invaded. Such a powerful Altman should not fail. Since he can be defeated by the lava man, there are naturally other reasons.
In Altman Story 0, the answer is given. Leo Altman's father was the first to feel it when the magma man invaded. He turned into an army in front of Leo to catch the lava man. Arrus Altman's mistake was to lead these helpless people to the battlefield.
Arrus Altman easily subdued his opponent, but Arrus Altman was kind-hearted and powerful, but because he was a royal family before, he didn't have much combat experience, so he saved his opponent's life. The magma man found that this Altman would protect the people behind him, so he launched a surprise attack while he was not looking.
When Arrus Altman turned to save people, he was attacked from behind by a magma man, penetrated his thigh and was taken hostage. Magma people know they can't escape, so they want Arrus Altman's children to come out in exchange. Originally, Leo Altman wanted to come out, but the magma man took Leo Altman's brother away because his eyes were full of fear.
Things didn't end there. The L77 Nebula is sadly called the gem of the universe, and magma people are determined to win it. What has just appeared is a pathfinder, and the magma people's army is still waiting in the universe. In order to destroy the invaders, Leo Altman's father fought alone.
In order to protect Leo Altman's younger brother, Arrus Altman blocked the photon cannon with his body, so he died.