The battle was not as evenly matched as imagined, or perhaps Nimia the Giant Lion was not as strong as imagined. Its combat methods consisted of pouncing, biting, tearing, pulling, and occasionally using a bit of Earth System Magic like causing the ground to shake. Its skin was indeed extremely thick, and the razor-sharp teeth and claws of the dragon could only inflict minor injuries.
Even though Li Si Te was controlling Formless Dragon Bard in Unity of Man and Dragon, and exerted the powerful Dragon Dou Qi Manual, he still couldn't inflict severe wounds on Nimia the Giant Lion.
After a full ten minutes of battle, though Nimia the Giant Lion was covered in blood, it was still lively with no signs of exhaustion.
"Really resilient!"