Defeat Hornet in Greenpath to get the Mothwing Cloak
Reach the Ancient Basin through the City of Tears or Kingdom’s Edge
Defeat the Broken Vessel in Ancient Basin to unlock the Monarch Wings
Travel to the bottom of Ancient Basin
Enter the Abyss through the large sealed door at the bottom of Ancient Basin
Use the Monarch Wings and Mothwing Cloak to navigate the Abyss
Open the Lighthouse in the Abyss to light the area
Continue through the Abyss to reach the Shade Cloak upgrade area