First idea of armor:
Make it looks like some crown or Knight helmet with chest plate and leggings
Soul Crown:
3 defence
Increases Critical Chance by 5%
Soul Knight Helmet:
4 defence
Increases Damage by 10%
Soul Chestplate:
7 defence
Increases Maximum Mana by 40
Increases Critical Chance by 5%
Soul Leggings:
5 defence
Increases Movement Speed by 10%

Set Bonuses:
With Soul Knight Helmet:
Increases Max Minions by 2
Increases Melee Speed by 8%
With Soul Crown:
Decreases Mana Usage by 8%
Increases Chance of not using ammo by 25%

Crafting recipe:
Soul Crown/Soul Knight Helmet : 25 Soul Bars
Soul Chestplate : 30 Soul Bars
Soul Leggings : 20 Soul Bars
Crafting Station: Hellforge

Ye, I suck at making balancing, even tho I tested over 200 armor sets from many mods

Maybe I just Should make Crafting Station like Soul Anvil (worst name ever)

After a bit of time, I made that this armor is a fusion of end pre-hardmode armor sets.
AHEM

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Soul Armor:
Soul Crown:
5 defence
Crit +8%

Soul Knight Helmet:
6 defence
Damage +10%

Soul Chestplate:
8 defence
Max Life +40

Soul Leggings:
6 defence
Speed +10%
Max Mana + 40

Set bonuses:
Soul Crown:
Mana Usage -13%
Ammo Usage -20%
Damage +10%

Soul Helmet:
Max Minions 2
Melee Speed 12%
Crit Chance +8%

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Recipe:
Soul Crown = Necro + Meteor Helmets + 20 Soul Bars
Soul Knight Helmet = Molten + Bee + 20 Soul Bars
Soul Chestplate = Molten + Necro + Meteor + Bee + 30 Soul Bars
Soul Leggings = Molten + Necro + Meteor + Bee + 25 Soul Bars
Crafting Station: Soul Anvil

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Soul Anvil (2x1) : 15 Soul Bars + 10 Evil Material on Demon Altar
Crafts:
Soul Armor
Flame Sword (No more evil bars, instead of them (20 Molten + 10 Soul))

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I think it’s a bit more balanced now… I hope…

add missile battery weapon maybe