Just like the spirit said, Noel had treated his spirits differently. He always asked about their opinions, making sure that whenever he utilized their power, it didn't harm them.
The spirits could feel Noel's feelings and helped him as well. In his past life, the spirits took a softer approach so that Noel didn't go into a very dangerous place just for an opportunity. Ardagan didn't give him an impossible mission. All the missions that looked impossible had been considered thoroughly, so before giving him any mission, he knew that Noel would be able to complete it.
That was why when Anna was here to change everything, the spirits gave him a more dangerous mission and a bigger reward. They took care of his Spiritual Energy Reserve and so on.
Noel created a mutual relationship with both Ardagan and Heisk.