Hi, Duke.
Many of the minibosses in the game drop materials for build daggers in transmogryfiing cube. Daggers have one important property - if any character is holding them, then is character completely immune to one type of damage (spectral, fire, electro, physical, toxic). Technician 69 spawns in each game with two randomly selected daggers in hand.So try to reset the location several times (log in/out game) until the technician spawns with daggers that do not block the damage of your blademaster, or use some other weapon set, if you have it.
Nightmare at Threadneedle is completely invulnerable until it takes at least one hit from a divine weapon.You can craft a divine weapon in a cube from a spectral dagger and a divine rune. In regard to the divine rune, inquire of the cabalist Crowe on Liverpool street. It is also possible to use the rifle that the character receives along with the cube from Nemo at the start of the game, if the beginner support is activated when installing the mod.Attack the nightmare from a greater distance, the bullet from the divine weapon will break into many smaller ones after the first projectile is fired, and only these small projectiles have the power to destroy the shield that Death uses.
Completing this last task is really hard, but the reward is the best dye kits in the game that cannot be obtained from any other monster.