The way this Build works is that you'll use dual wield two Rotten Crystal Spears to not only apply Scarlet Rot, but also build up your Attack Power quickly via very fast L1 attacks thanks to the Winged Sword Insignia and Millicent's Prosthesis. Dual Spear attacks are some of the fastest in Elden Ring, and they attack faster than many R1 attacks of other weapons.

Additionally, Spears deal Thrust Damage which deals increased damage to enemies in the forward motion of their attack (called Counter Damage). This allows you to shell out some incredible damage when your Attack Power is buffed if you can trade blows with Bosses, particularly because we have the Spear Talisman slotted which further increases this damage.

Coil Shield can trigger Deadly Poison (a stronger form of Poison) on Bosses easily with one use, or two at most, triggering your Kindred of Rot's Exultation at the beginning of the fight, allowing you to have buffed Attack Power from the very beginning all while the Boss takes damage over time.