Wei Wuxian spent so much of his time in the mounds trying to stay alive. He was trying to find some sort of way to get himself out of the mounds, though his motivation deters from day to day, and it makes it hard to keep going. As it has been a little over a month now, he had made the Yin Hu Fu.
The sword he used was a fifth yin shard from the yin iron. He found it to be the strongest yin shard he had been in contact with, so he felt that this shard was the main source. To keep it from getting out of control too much, he made it into two pieces. When activated by pressing the two halves together, all Fierce Corpses within a certain area come under the wielder's absolute control.
The yin iron a special type of metal that absorbs unusual amounts of resentment under the direction of Xue Chonghai several hundred years prior. After defeating Xue Chonghai, the Five Great Clans divided the Yin Metal into four pieces and hid them among places of benevolent energy, not realizing that a piece was made into a sword and hidden within Xuanwu the slaughter.
He kept the amulet at bay placing a webbing around it until he finished working with the black bamboo. He found some sharp stone and began carving into the bamboo, creating designs in it and many holes to create a bamboo flute or Dizi. He then began to cultivate the flute and the amulet. The bamboo flute began to soak in resentment and turned into a ghost flute.
Since Wei Wuxian had spent many months studying in Cloud Recesses, he remembered their music techniques and mind calming techniques. He decided that, that was the best way to help him keep himself in control. As he started practicing the flute and learning to play, not only did he find himself actually quite good at it, but he felt that he and the flute were now connected. Which meant that the flute had a spirit and only spoke to him, it became a first class instrument.
Wei Wuxian spent the last month in the mounds getting stronger and learning to continue to control the resentment. He learned that using his flute, was a good way to do that, but he also found that the resentment fed off of his emotions. So if he was angry, he would more than likely lash out beyond his control.
He knows that even without his golden core, this path will be difficult. He was preparing himself for what people would possibly say. Maybe even call him out on not using a sword anymore. He cannot use it, and no one had to know the real reason why.
He knew the risks, and he still chose to walk down the path he has chosen.
***
Lan Wangji managed to keep himself busy in his home, the Jingshi. He was still waiting to know what was happening and what happened to Lotus Pier. Lan Wangji sighed as he couldn't focus again and went out for a walk. He decided to make a round and patrol the grounds. Upon reaching the main gate, he saw Jiang Wanyin standing there asking to enter the premises.
Lan Wangji went to him, "Jiang Gongzi," he greeted, "you can enter."
"Thank you Lan Er Gongzi," Jiang Wanyin said. He glared at the two guards standing at the gate before walking in, "I was actually hoping to speak with you, and if Zewu Jun is here, I would like him there too. If that is alright?"
"Mnn, come with me," Wangji said.
He led Jiang Wanyin through the courtyard to the Yashi where his Uncle and Brother were, "Shufu, Xiongzhang, Jiang Gongzi is here and wishes to see us."
"He can enter," Lan Xichen said kindly.
Jiang Wanyin entered and bowed as a greeting, "I have actually come to ask for your assistance. I have sought out assistance from Jin Gongzi and Sect Leader Nie and have been grateful for their aid."
"What would you like our help with?" Lan Qiren asked.
"My A'Jie and I have spent the last month or so trying to find my sworn brother Wei Wuxian. He has gone missing and we fear he might be in Wen Ruohan or Wen Chao's hands. I asked if you would be kind enough to help us look for him?" Jiang Wanyin asked.

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Those Three Months
FanfictionLet's take a more detailed look at what Wei Wuxian really went through when he was thrown into the Burial Mounds by Wen Chao. Read through his thoughts and the resentful torment he endured for three months. See how he went from almost giving up his...