I can't really help you on how to do this, I can only give you some tips:
If you need help with any boss, this guide by wataniyob will help you out: Lurien the Watcher, found in Watcher's Spire atop the City of Tears.
Monomon the Teacher, found in Teacher's Archives in the middle of Fog Canyon. Herrah the Beast, found in Beast's Den at the left end of Deepnest. The Traitor Lord - fought at the top left of the Queen's Gardens. Zote the Mighty - fought during the first round of the colosseum of fools. The Collector - fought at the top of the Tower of Love. The Lost Kin - dream version of the Broken Vessel. The Broken Vessel - fought in the left end of the Ancient Basin. The Soul Master - fought in the Soul Sanctum at the top of the City of Tears.ĭung Defender - fought in the Royal Waterways. The Mantis Lords - fought at the bottom of the Fungal Wastes/Mantis Village. Hornet, again - fought in Kingdom's Edge. You need the Dream Nail to fight this boss. Entry to the fight is behind a secret wall in the False Knight's arena. The Failed Champion - dream version of the False Knight. The False Knight - fought in the Forgotten Crossroads at the very beginning.