Go up the staircase on the right.

Summon Melina because she is very helpful.

Options-> right-> triangle on a pouch.

After that, select Margit's Shackle.

And buy from Patches the Margit's Shackle.

This cheese uses a scarlet Rot weapon.

And get the magic Glintblade From Miriel.

You can use Lusat's Glintstone staff from Sellia.

After that, enter the mist to fight Margott.

First time meeting Margott Cutscene.

Lock R3 on Margott and get close.

After that, use Margit's Shackle (triangle + down).

And then use Antspur rapier to apply scarlet rot.

You have to back away and switch to Glintstone staff.

Cast R1 until all FP (blue bar) uses FP.

Drink (square) Cerulean tears to refill FP.

You have to repeat casting magic Glintblade spells.

But don't get too close, let Melina Tank.

At Margott half Health, you need to stay back.

You have to stay very far away in second half of fight.

And wait for scarlet rot to damage over time.

And then get Remembrance of the omen king.

And then go back to activate Elden throne grace.

Reset at grace to hear Melina talk.

Get Rold Medallion from Melina.