To many Tai Ah Divine City cultivators, going out into the Divine Wilderness to hunt desolate beasts was a big deal. Their training expeditions would often last for about half a month. They had to make all sorts of preparation for the long periods outside.
It was insufficient to just be strong if one planned to go out alone into the wilderness. One had to know all sorts of skills and survival knowledge to survive out in the wilderness.
Before Yi Yun left, he spent another 50,000 dragon scale runes to buy a interspatial ring with a larger capacity than the ones he got from the Capital's Four Bully Lords.
Following that, Yi Yun used an entire day to buy various supplies.
It included bone relics, medicine, life-protecting disk arrays, spare weapons, etc.