Dark Side

the Dark Wizard 

"these guys aren't that strong but you shoudn't underestimate their magic capabilities to control their projectiles to follow after you."

they have 30 HP and shoot magical homing projectiles at you.

Special Drop:

Dark Cape

can be worn as armor, has a chance to teleport you when you are being attacked

the Necromancer

"these undead mobs will not summon an infinite amount of monster like you might expect no of course not this would be way to annoying, ... so i made it even worse."

these mobs have 60 HP and will occasionally shoot a projectile at you but that of course not all it does also aggro all mobs in a big radius around it at whatever it attacks, and empowers most undead mobs around it exept for Necromancers.

Special Drop:

Summoning Skull

can be used to teleport a undead mob, that fights for your, at the position you are looking at

it can also be crafted into a block that does the same thing over a longer period of time

the Soul Guardian

"you could say that their behavior is truly soulless but with the countless souls they have already absorbed this would be far from the realty."

For these wither skeletons souls are nothing more than energie, they have 45 HP and can absorb the soul energie of their enemies to heal themselfs and if something gets to close they can still kick it away with their leg, this melee attack afflicts the wither effect and does quite a bit of knockback.

Special Drop:

Soul Heart Crystal

you can absorb soul energie to heal like the Soul Guardian