The WARLORD

"Tell me what I have to do to make you willing to be my warlord?" King Alventius stared intently at the figure of a man who was no taller than him, but more robust and charismatic than any general he had ever met.
The man, Rendevis Oldernys, just stood still. He didn't give any answer. This was the umpteenth time, he had the arrival of royal dignitaries in the northern region. His ability to understand not only human language, but also animals, plants and the unseen world, makes him a target for great kingdoms who want to make himself their warlord, to help them become the sole ruler of the world.
"What do you want? Treasure? How much do you want? Or women? I will give you new girls every day to satisfy your lust. Or do you want to be the leader of the generals? I will easily give it to you.” The persuasion of the dignitaries continued to be made so that the dashing and handsome man was willing to join them.
Another day, the leader of the wizarding world came to visit with the same purpose. Until they offered Rendevis the elixir of immortality. However, the man's attitude remained the same, not giving any answer. He just listened quietly like a healer who listens to the complaints of his patients.
“What do we have to do to get you to join our army?” The King of the Land of Water did not miss his part in persuading Rendevis.
"There is no. I'm not at all interested in all of your offers." The same short answer that was always given after a long time he had been a loyal listener of those dignitaries.
"Please go back to your country. I will not leave this place, unless there is a very urgent situation on earth."
Who exactly is Rendevis Oldernys? What kind of emergency is Rendevis referring to? Who will succeed in proposing to become a warlord?