Wilbur's Resurrection is the ongoing attempt to resurrect Ghostbur into Alivebur. The resurrection attempts take place at a shrine built by Eret in the L'manburg Crater, where the button room once was.
After the events of the Doomsday War, Ghostbur logged on to be met with the aftermath of L'Manberg's destruction. After speaking to Phil about the day's event, he returned to the survivors of the conflict stating he'd changed his mind about being a ghost, and that he wanted to be brought back to life and return to being Alivebur. Initially, he believed that Dream was the only one who could bring him back, but after discussing it with Quackity, he realised that Dream's power was probably not enough and decided to look for someone else who could do it for him.
The two encountered Eret, and hoped that he could help their situation. However, it turned out that his power was relatively superficial. Eret then proposed that Phil, the one who killed him in the first place, may be the only one to revive him, and so they got into contact with him to see if he could help. Phil happened to be researching necromancy and also had the sword he used to kill Wilbur. Since Ghostbur described revival as a second death for him, he proposed that Phil would need to kill him in the same way he was killed the first time - with that sword in the button room.
Before the resurrection was set to go ahead, Eret decided to make a shrine to increase the chances of the resurrection working, as the button room had been completely destroyed by the events of Doomsday. He gathered items that would be valuable to Wilbur and his character such as a L'Manberg flag, TNT, gold, salmon, buttons, brewing stands, and blue to build the shrine.
The group gathered at the shrine in order to begin the event. Ghostbur and Phil decided to go through the scene of his death on November 16, word for word, in order to start the resurrection process. Before the scene started, Tommy appeared, walking in on the scene just before the process began. He offered to lend a hand, playing the role of himself. They went through the process of the event, but Ghostbur voiced his fears about going through with it, stating that he didn't really want to go.
Torn, Ghostbur asked Tommy if he wanted Wilbur back. Tommy replied that Alivebur "wasn't so poggers". Despite his fears, Ghostbur stated that he needed to be strong, and the only way that he could be strong was to die so he requested for Phil to do it. Phil went through with it, and Wilbur disappeared. Tommy immediately grew worried and frustrated, and the group wondered if it had worked, or if they'd accidentally killed Ghostbur for good. Tension ran high as Phil and Eret called their research into question.
A minute later, Ghostbur returned. Reportedly, in his perspective, everything went dark, and he felt the pain of being stabbed, but he stayed as a ghost. He reportedly met two people in his temporary state of death, but couldn't identify them as he didn't have enough time to look at their faces. It is now known that these figures were Schlatt and Wilbur.
Not done yet, Phil proposed that they needed a totem of undying for the resurrection to work. They noted that Techno has one, so Ghostbur proposed going to him to get it. However, Phil was hesitant at that idea, recognising that Techno probably wouldn't appreciate parting with his only remaining totem. Unsettled by the developing situation, Tommy left the group, who decided to go and find Friend, desperate for things they might have missed. Ranboo voiced concerns about doing the ritual over and over, but Ghostbur dismissed the concerns. Phil also raised his own concerns, specifically about the two people Ghostbur saw in his death state.
After going through the death procedure completely, with Ghostbur screaming at Phil out of panic in the final stages, Ghostbur disappeared, and Schlatt's voice rang out. Schlatt voiced that he did not want to come back to the server, also stating he was busy doing something else.
The resurrection failed once more, and Ghostbur remained a ghost. However, Ghostbur saw something different during his absence. This time, in the afterlife, only one person was there. The group, alarmed, decided they absolutely needed a totem of undying for the ritual. Schlatt's spirit also seemed unsettled by the resurrection, and he kept speaking through Ghostbur. Ghostbur appeared to be shaken by the revival and had to leave to lie down, clearly feeling unwell.
Left to theorise in the aftermath, the group decided to theorise on the identity of the last person that Ghostbur saw. Fundy wondered if it might be the real Alivebur and questioned if it was worth messing it up. He worried about their separate identities, as if Ghostbur's spirit was torn away from Alivebur. The group restated that they absolutely needed a totem, concerned about the state of his soul. Phil and Eret decided to go off to keep planning for their next attempt, though Eret wasn't allowed into the cabin.
Phil and Ranboo decided to go out and find a totem, as they weren't sure if Technoblade would give them his totem to use to revive Wilbur with. After securing a map, the two returned to Dream SMP to meet with Eret, who hadn't been allowed to Techno's Cabin. Along the way, Tubbo joined the group.
The group spent a good amount of time trying to locate the woodland mansion because they kept overshooting the correct location. They eventually found the structure they were looking for, securing multiple totems of undying.
Tommy also seems to have separate plans to bring Wilbur back to life, or has at least enabled the separate attempt, the plans hinging around Dream's hidden knowledge of resurrection.