How to open the door of the high-level warlock hall in the broken hall?

The door in the copy will only open itself after killing Lao 1, or a skilled thief will unlock it, or an engineering explosive will explode.

There is a jumping point on the right opposite the door, and there is a soft mud monster below. Go straight up and there will be a passage to the old room 1 on the left. The mud monster brushes infinitely, and when he enters the channel, he will kill Xiao Ruan.

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