The speaker of this book 
The speaker of this book is given a "reed like unto a rod" and is told to measure the temple of God and the worshippers inside. Some events of this book are set off by the "Lion of Judah." It describes the star Wormwood, which poisons the waters it falls on. Martyrs cry for the "word of God" in this book during the opening of the fifth seal, which is followed by seven trumpets blown by seven angels. Its authorship is attributed to John of Patmos. For 10 points, name this last book of the Bible that describes the end of the world.
The speaker of this book is given a "reed like unto a rod" and is told to measure the temple of God and the worshippers inside.
Book of Revelation [do not accept "Book of Revelations"]