Hollow Knight

After you get the Dream Nail in the Resting Grounds, you will be given the task of killing the three Dreamers of Hallownest to break the seal on the Black Egg Temple to defeat the Hollow Knight. You can attempt them in any order you wish. Lurien the Watcher can be found in the City of Tears in the Watcher's Spire. You can only access it with the Monarch Wings. Once you have climbed high enough, you will encounter the Watcher Knights, six knights who will attack you two at a time and when one is defeated, another will take their place. Their attacks include swinging their great nails at you twice which can be easily avoided. They will roll up into a ball and start rolling throughout the boss room which can be dodged by jumping over them and swinging your nail downwards to do some damage. They can also bounce around the screen when rolled up into a ball which can be hard to avoid,but can be dodged using the Mothwing Cloak.

If you're having difficulty fighting six, there is a secret passageway before the battle in which you can drop a chandelier on one, knocking it out of the battle which reduces the knights you have to fight down to five, making it just that little bit easier. When all six knights are defeated, you can climb the rest of the tower to see Lurien asleep. Hit him with the Dream Nail, entering his dreams. Attack his spirit and hold to absorb his essence. Once the seal is broken, this trophy will be yours. Be warned, that whichever Dreamer you defeat or you get the Monarch Wings, the Forgotten Crossroads will be covered in infection, enemies will be stronger and will explode causing two masks of damage.