Tarentek did not expect convincing their leader to be easy, and while he was not quite as accepting as he hoped, he knew that it could be going far worse. Raldel's skepticism was understandable, even if his people weren't as secluded as they were. All Tarentek had to do was provide compelling enough evidence to make him take the threat seriously. 

"She brought me here because I showed what this enemy can do. I still bear the scars of the attack." He explained before pulling back his robe just as before, revealing the scars that still covered a large section of his body. They evidenced a weapon that gave burns, along with many smaller cuts, but above all, the scars showed that the enemy had weapons entirely unlike any Raldel's people had likely seen before. "I was hit by a glancing blow from one of the weapons they have learned to use. It was a small object, not unlike a fruit in its shape, but made of metal, or at least it looked like metal. In an instant, it went from being harmless on the ground, to creating a deafeningly loud fireball of light and heat. It was hard to tell in the moment exactly what happened, but I think it sent out many objects, like small bullets, in all directions. I was far enough away to only be wounded, but my allies closer to the weapon had their flesh torn from their bone. It is a weapon that would be easy to use against flying opponents such as your people. There are many other things I can describe to you about their capabilities, given enough time, but if you are still doubting their existence, then I would recommend you send scouts to the city of Amman, to the northeast. If you do not know its location, I can point it out on any maps you might have. They either captured or destroyed the city, but in either case, their soldiers would still be present. You could see for yourselves their numbers and advanced weaponry." Tarentek recommended.