Corrupted Overseer Titan

It was a normal day in my world, I was happy because I had defeated the dragon after killed the Wither Boss a few days before. When I came at my house, that night, I found something strange in one of my chest on the second floor.

I opened the chest and inside I saw a ticket with this name: "He is here" For some seconds I thought it was a part of a new update. So I look the list of the new things introduced in the new 1.15 update without find anything about what I found. Without information, I left the house and I see something scary: My world had become purple and blue with a grey and yellow sky.

A few blocks away I saw a pedestal created with black concrete and on its it was a blue shulker box. inside the shulker there was three book and quill renamed: Dragon Egg, Nether Star, Channeling Trident and Conduit.

I didn't now that it mean until I put the object near their book with their names. After this a message appeared in chat: "This is the moment of the truth." and I was teleported in one giant base in the maximum height possible in Minecraft, over 200 blocks. the sky base was all in normal glass and at the bottom of the base there was an arena. I saw the stars and the clouds and someone writed in the chat with corrupted Overseer Titan name: <> <> was my answer.

When I a was a few blocks at the center of the arena, one skin black with purples and blue details, appeared in front of me saying: <>

I hit him with my diamond sword enchanted with sharpness V but I thin  I didn't even damage it until he killed me. My desktop wen out and  when I reopened Minecraft the world it was known