El Famoso...
As usual Digaly, take your time, no pressure !

Variants:

Double Trouble: When this variant spawn, spawn a copy of himself.

Layer: This variant lay an egg every 10 seconds, the egg be destroy after 2 seconds and spawn a mini version of the layer (like the mother) (The limit of mini variant increase depending the level)

Idolatrous: When this Variant die, spawn a random NPC/SNPC (I really want this one, he can be awesome !)

Necromancer: When this variant is near a corpse, transform them to some zombies who serve his master ! (Zombies are stronger and healthier depending the level)

It's all for variants, but I have an idea of balance:

The Metal Variant is really Intricate... Before He was too strong, and Now... I prefer use ammunition instead use explosive or grenades..

I think the resistance of this variant sould be increase.
95% or more Resistance instead of 90% Resistance

It's all !