A small zombie stands still. My sister and I played on version 1.21.21 We entered the seed ourselves, it was the "real" herobrine seed (it is shown in the photo). But, throughout the entire survival, we did not see any mysticism. So. We went into the cave, or rather my sister went, and I came to her using the coordinates. There was a lot of iron there, we even found diamonds! We went to the end of the cave, and there was this zombie.