In Elden Ring: Shadow of Elden Ring Items the Erdtree, there's a cheeky strategy to defeat Rellana, Twin Moon Knight, without ever entering her boss room, reminiscent of the infamous dung pie tactic from Dark Souls.
How to Cheese Rellana, Twin Moon Knight:

    Find the Rear Fog Wall: To execute this strategy, you need to locate a specific fog wall behind Castle Ensis. Travel southeast through a ravine, ascend a couple of sealed spirit springs to the Fort of Reprimand, and then proceed north to reach the back entrance of Castle Ensis where Rellana’s fog gate is positioned.

    Cast Long-Range Magic: From behind this fog wall, you can hit Rellana with spells like Flame of the Fell God (recommended by X user Ziostorm), Moonveil’s ranged attack, Impenetrable Thorns sorcery from the DLC, or even Carian Sovereignty, which is Rellana’s own spell. Ensure the spell has sufficient range and impact to reach and damage her in the center of the arena.

    Be Cautious: Some players have reported that Rellana might still attempt to fight back through the fog wall. Be prepared for potential retaliation.

Why You Might Want to Fight Her Normally:

Rellana offers one of the DLC's most exhilarating battles. As a dual-wielding Carian knight who uses magical moons as projectiles, her fight requires quick reflexes and precision, making it one of the most exciting duels in the game. Her battle theme alone is worth experiencing, and the challenge adds to the overall thrill.
Tips for a Legitimate Fight:

If you decide to face Rellana directly, consider exploring the area around Castle Ensis to collect Scadutree Fragments. These items can provide valuable resources to help make the fight more manageable.
Best Weapons in Shadow of the Erdtree:

One standout weapon from the DLC is the Backhand Blade. While it may not have legendary status or significant lore, it’s a top choice for many players due to its effectiveness.

    Dual-Wielding Advantage: The Backhand Blade is unique as it can be dual-wielded, allowing for swift 4-hit combos with each attack landing twice, except for the last one. The heavy attack combo is shorter but still effective.

    Unique Skill – Blind Spot: This skill lets you dash to the left, sidestep to the right, and strike from behind, making it highly effective against many enemies. Although it may not dominate in boss fights, it simplifies many regular encounters.

    Build Recommendations: To maximize the Backhand Blade's potential, use a Strength/Dexterity build. Upgrading the weapon to +25 with a Keen Affinity will leverage its D Strength and S Dex scaling for optimal damage.

Shadow of the Erdtree brings new challenges and over 100 new weapons to Elden Ring, enriching both the DLC and the base game. The careful balance between new and existing weapons ensures that while the best place to buy elden ring items PVP meta may shift, your favorite builds remain relevant and exciting. Enjoy the expanded world and the fresh experiences it offers!