How to get Chilrend
The first thing you will want to do is get the shout whirlwind. To get that you will have to finish the dragon stone quest you get from the Jarl in Whiterun. After that you will have to kill a dragon at the watch tower, you will then get summond by the greybeards and you will learn the way of the voice. Once you have learned whirlwind go to Riften and go to the temple of Mara. Jump on the roof by jumping on fire place outside of the temple, jump on the roof and sprint back and forth till you get to the top of the roof. Walk to the other side of the the building (still on the roof) and look around. To the left you will see a building with a platform and a door straight ahead where you are standing. Use your whirlwind sprint to get to the door and go in. There will be two guys in there so be perpaired, the next thing you want to do is go in every room and look for a dresser like cabint it will open not normally and it will be empt press the very back of the dresser and there will be a secret room. Follow the path till you enter this room, be warned there will be trappes on the way. You will see this table look to the right and you will see a sword case. It will be locked and really hard to open so make sure to bring alot of lockpicks. Once you open grap Chilrend and go.