Viridian Amber Medallion +1 is a Talisman in Elden Ring which can be used to Raises maximum stamina. You can use this Talisman to increase different stats in-game. Like Viridian Amber Medallion it is a straight upgrade. It can also be useful against Player vs Player fights where you need a lot of dodging and jumping to stay away from attacks.
You can find Viridian Amber Medallion +1 in Altus Plauteau site of Grace near south of the outer wall of Battleground.
How to get
Upon reaching the location you will encounter a boss named Margit, The Fell Omen. You defeated this boss in Limgrave. Defeat this Boss again to get the Viridian Amber Medallion +1.
Strategy to defeat the Boss
This boss has different attacks most of them are include Slash and heavy slash after his health down to 50 or 70 percent. Also, do a three-hit combo attack and throw magic daggers towards you. The best way to fight this boss is by using your horse. Simply dodge his attack once the boss performs his attack and sub attacks use your different tactics to defeat the boss. After defeating this boss you will be rewarded by Viridian Amber Medallion +1.
You can also get this by defeating Miranda the Blighted Bloom in Tombs-ward cave within the Weeping Peninsula. This cave can be found south of the Weeping Evrgaol.
Miranda the Blighted Bloom
This is a Boss in Elden Ring which is a poison flower. Uses Poison rain to attack and can be simply be defeated. After defeating this boss you will be rewarded by Medallion.