Kill two hands outside the church, and then go in and light four braziers, as shown in figure 1~2.

Figure 1

Figure 2

Someone inside will summon two demons and some men to hit you. After killing them, people will run to the secret passage and there will be a library npc. She said that pure people always hide behind the obelisk and say something. Don't trust her at first. Look around in it. Figure 3.

Figure 3

The door on the second floor is here.

There are many books on the second floor, including the book Dead XXXXXX. Sorry, I forgot the name. Books with the word "death" have the order of gut opening. According to the clues in the book, the organ is hidden in the four directions of the southeast and northwest of the picture, and the door will open. These four organs are too small to be found. Look at pictures 4~5~6~7.

Figure 4

Figure 5

Figure 6

Figure 7

Among them, the organ in Figure 4 is the organ in the East. Having told you this, I understand the remaining three positions. After opening it, the boss started fighting. Until then, that person will appear. This is after he defeated the death knight, he summoned many demons into the room to get the blood needed to crack the death knight.