NPCs & Enemies Better Crimson Biome

[superchickenpig101]

(Pre-note: I love the Crimson, this is just how I think it could be improved. I am often on the steam forums for Terraria and see lots of hate for the Crimson so this how I think it could be better.)
Now that's out of the let us begin.
1. Mechanical Brain of Cthulhu.
Name: the Master Mind.
Attack #1 Mechanical Creepers, fewer than the BoC
Attack #2 Shoots Ichor
Attack #3 Teleports randomly on the screen
Expert ability: at 1/3 health the Master Mind will start to spawn more mechanical creepers until it dies.

Crimson Nights Edge/ True Nights Edge:
Name: The Bloodied Blade/ True Bloodied Blade
The Bloodied Blade: does less damage than the Nights Edge, but you get life steal.
True Bloodied Blade: still does less damage, but it shoots ichor shots.

 

[Lord Garak]

The Destroyer isn't a copy of the Eater of Worlds.

Why does the Night's Edge need a counterpart?

 

[superchickenpig101]

The Destroyer isn't a copy of the Eater of Worlds.

Why does the Night's Edge need a counterpart?

I feel that the Destroyer is very similar to the EoW, not a copy but similar, so in my mind, it just makes sense that there would be a BoC mech boss.
I don't know why but the Nights Edge just seems like a corruption weapon to me, another thing is the Blood Butcher and the Lights Bane is so different it just doesn't feel right that they make the same weapon.