Cloaks.
Big Yellow was familiar with the cloaks in Ou Yangming's hand because their raw material was from Fat Antelope.
Back then, Ou Yangming did his best to deceive Fat Antelope to obtain its magical fur, such that it willingly left the Silver Ridge and the 10,000 Beasts Ridge. The young fellow gained its fur and refined it into cloaks, but he had not used them before.
The big yellow dog blinked as if it was asking a question with its large eyes.
'Are these… Useful?'
Ou Yangming grinned. He put on one of the cloaks, then he retrieved a formation board and placed it beneath his feet.
Next, Ou Yangming disappeared in the eyes of Big Yellow. Instead, an average-sized rock appeared in front of it.
Big Yellow's eyes lit up. It smiled brightly and nodded satisfyingly.
It had been following Ou Yangming for a long time, so while it could not release Illusion Formations, it would recognize one.