The final boss of the Shadow of the Erdtree DLC is Promised Consort Radahn, who is one of the hardest bosses in Elden Ring. There are two phases of bosses to face in this boss fight, where the player first fights Radahn, and in the second phase Radahn will be empowered by Miquella's power, which is a nightmare for all players.

Although Radahn in phase 2 is very powerful, it can be defeated when we can dodge or defend against its damage. For this final boss, we can use the Carian Thrusting Shield Build, and the guide below will go over this build in detail.

Carian Thrusting Shield Build

This build combines strong defensive capabilities with offensive potential, allowing it to survive longer and fight back against the Shadow of the Erdtree DLC final boss.

Tips: Buy Elden Ring items from U4GM to quickly obtain them.

Weapons/Equipment

Bloody Helice+10: The Bloody Helice is a powerful thrusting sword in the Elden Ring that excels in dealing with piercing damage and inflicting blood loss on enemies. (This weapon's effects target Radahn's weaknesses.)

Carian Thrusting Shield+25: Allows for simultaneous attack and defense, which allows us to survive longer and counterattack.

Talismans:

Dragoncrest Greatshield Talisman: Allows for a significant increase in physical damage offsets.

Greatshield Talisman: Reduces stamina damage taken while blocking by 20%.

Pearldrake Talisman +3: Boosts non-physical damage negation by 11% (reduced to 4% in PvP).

Two-Headed Turtle Talisman: Greatly raises stamina recovery speed.

Armor Set: Rellana's Armor Set

Rellana's Armor is a new armor set introduced in the Elden Ring: Shadow of the Erdtree DLC. This armor set offers physical and magical protection, making it suitable for various builds.

Rellana's Armor

Rellana's Gloves

Rellana's Greaves

Rellana's Helm

Incantations:

Erdtree's Favor (Increase your maximum stamina)

Spirit Ashes

Attribute Values

Vigor: 60 (As high as possible to be able to increase tolerance during combat) 
Focus: 14 (As high as you want, if you're going to put more prayers, you can point it higher.) 
Endurance: 50 (As high as possible, the higher the energy bar, the more you can carry damage.) 
Strength: 48 (Adjust according to the equipment you are using) 
Intelligence: 10 (No requirements) 
Dexterity: 19 (Adjust according to the weapon you are using) 
Faith: 38 (Adjust according to the weapon you are using) 
Arcane: 28 (optional, to make the bleed a little stronger)

Tips for Beating the Final Boss in Shadow of the Erdtree

The point of fighting Promised Consort Radahn is to control the consumption of Stamina. You should never drain yourself at the start of the fight while the boss is continuously attacking, or you will be easily spiked in phase 2.

How to control stamina

Attacks, dodges, blocks, and sprinting all consume stamina. Avoid spamming actions and give your stamina time to regenerate between engagements.

Know how many more slashes the boss is going to make during his barrage of attacks so that you can minimize the number of unnecessary actions.

Always observe whether the stamina is bottomed out, you need to let go of the defense in the gap between the boss does not attack, which allows us to recover more energy.

Pay attention to the blood level

Although the Carian Thrusting Shield Build greatly improves our defense, we will still lose blood when fighting Radahn.

All of Radahn's moves cost us blood, so we need to drink potions in between boss attacks.

As long as we keep defending then most of the boss's attacks won't be a threat to you, but a few of them will still cause more blood loss.

Rock throws

We have to be especially careful with Rock throws during the fight, as each meteor will cause us to lose blood.

Phase 1 Rock throws can be dodged by simply rolling.

Phase 2 will cause a lot of blood loss as Radahn will use more skills, so it is recommended to keep your shield up throughout this stage.

Miquella's grab/charm

Radahn leaps into the air, drops down, and grabs you. This doesn't hurt, but marks you with a debuff that means you're killed if he can hold you again, no matter your health. To avoid this attack we need to roll towards Radahn at the last second.

Meteor Dive

When Radahn's life is reduced to 25%, he will jump up and make a huge impact as he falls. To avoid this attack we need to choose a direction and run as fast as we can.