Guide to defeating The Collector and Markoth in Hollow Knight's Kingdom's Edge. Find the final Grubs, The Collector's Map, and learn strategies for these challenging bosses.
If you gave Geo to Millibelle, go to the Pleasure House and get what's yours; she'll be on the hot spring at the top. The next objective is below the Stag Station you came from, prepare for a boss fight. Jump on the water and keep going right.
Go to the top left side and use the Love Key. Follow the path to the end and you'll encounter The Collector.
The Collector
This boss will usually leap all the time and drop glass cases that will spawn enemies. Focusing shouldn't be an issue, as long as you're on the other side of the screen (and there isn't more than 1 enemy) you will be able to Focus just fine. His leaps are slow, but bring Quick Focus if you're struggling. Aside from that, there isn't much strategy, the pattern is very predictable.
After defeating The Collector, go to the right and above for the last 3 Grubs! A little bit to the left of the last Grub is The Collector's Map. This will let you see missing Grubs in the map. Take the upper right path to Kingdom's Edge. Take the path towards the shadow gate and challenge Markoth.
Markoth
Markoth has a shield floating around him all the time and will attack with Nails that will appear out of nowhere on different parts of the room and go towards (but won't follow you). After a while it will make his shield circle around him, but faster and reaching farther. After attacking him enough, he will summon a second shield and the intervals between nail attacks will be shorter. You should aim to heal during the shield attacks, but if you don't need to heal, you can get near him after the shields have reached farther and he will be vulnerable to attacks. If you can spare the Soul, climb the walls and use your Shade Soul attack against him.
When you're done, check the world map to see if you've missed any Grubs and let's pay one last visit to the Grubfather. Take the Stag from King's Station to Dirtmouth.
SPOILER
If you visit the Grubfather one more time after sitting on a Bench, you'll come back to an inflated Grubfather and you'll hear the Grub's cries from inside him. It isn't clear if this is a cruel act, but I'm inclined to believe otherwise seeing as the achievement is called 'Metamorphosis'.
Take the Stag to Resting Grounds.
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