1st: Stop crying about your RNG, you don't DESERVE anything. You just need to increase your chances. Don't bitch and moan if this doesn't work the first time just try again. This is how I got mine: Clanmate and I both saved up 5 keys each, did the heart run and made it to the chest room. We let the 4 randoms go first and they all used one key and didn't get it. We both used all 5 keys on the remaining chests, and on the 14th chest, and my last key I got it. If a random had gotten one before us, we were just going to do another run and not spend any keys. He didn't get one, so we're both going to do it again for him once we have 5. It's pure RnG which chest it's in. We simply just increased our own personal chances. Good Luck and remember you don't DESERVE to get this weapon.