Is Archdragon Peak Optional?

Archdragon Peak is an optional location that can be accessed by performing the "Path of the Dragon" gesture near the meditating dragon statue in the Irithyll Dungeon. ... Archdragon Peak also overlooks on the body of an ancient dragon.

Is the Nameless King optional?

The Nameless King is one of the optional Bosses in Dark Souls 3. This boss appears on Archdragon Peak, after ringing the large bell. The King is an optional boss, and does not need to be beaten to complete the game.

How are you supposed to find Archdragon peak?

This is just after you defeat Dancer of the Boreal Valley, take the ladder up and go to the left, progressing to the boss fight. After you have the gesture, go to Irithyll Dungeons and follow the path. Use the Path of the Dragons Gesture here, and you will see a cutscene that will teleport you to Archdragon Peak.