Drops: Demon Hearts, used to make Crimson Ingots. XP: 20
The Withered Demon, is a slow, but hard hitting creature, with every attack knocking up the target, just like an Iron Golem. The attack is dodge-able, as he needs to charge up his hit. It is a mere mindless hollow, compared to it's former glory days, it only knows hatred for the unknown, and especially the Withers. It spawns in the nether on Crimson Nylium blocks, therefore naturally spawning in the crimson forest. Killing it will make it drop the demon Heart, an item that can eventually be crafted into the Bloodthirster with enough ingredients.
Drops: Soul Ingots.
Remnants are lost souls of the underworld, spawning with random equipment of Soul Ingot Armor and the Translucent Weapons Set. These mobs will spawn as an Evil version from The Returning Knight, only attacking players. They can also be randomly summoned by Nightfall if a player kills an undead with it. It will then be the player's guardian, seeking out other mobs and protecting the player. Killing it will make it drop some of it's equipment and some Soul Ingots. It can be right clicked to make them stationary on that position.
Drops: Lost Souls, chance to drop Soul Robes armor set.
Originally healing priests part of the Moonlight Champion's congregant, something twisted their minds along with their master. They can be summoned by The Returning Knight, spawning with the full Soul Robes armor set. They will do anything in their power to heal the great Returning Knight, but if the boss is not present, they will relentlessly attack the player with their beam of magic, dealing damage each second. Killing them will sometimes make them drop their equipment and some Lost Souls. They will also naturally spawn in the Cathedral of Resurrection structure (excluding 1.19.3).
Drops: Chungus emeralds, used to make the Big Chungus Music Disc. XP: 50
Intended to be a joke creature, these fierce beings spawn in the forest at night if within the 32 block range of a Chungus Monolith. Do not be tricked by their appearance, as they move and attack ridiculously fast.
No drops.
The Familiar Ghost can be summoned with 3 soul charges with the Soul Reaper weapon and will protect it's master, just like the Remnant. It can be right clicked to make them stationary on that position. It's former life still haunts the creature. It even looks familiar to you... how long ago did you harvest a soul to summon this creature?
Drops: Chance to drop the Frolorn Armor set.
The Forlorn are forgotten elite soldiers, summoned to do you bidding with the Soul Reaper when you have at least 10 soul charges. It will either wield the Heap of Raw Iron or The Forlorn Scythe, a weapon that can only be acquired by killing them. It can be right clicked to make them stationary on that position. They will also spawn equipped with the Forlorn armor set, a set with equal power to diamond armor. This armor set can only be acquired by looting them. Hostile Forlorn may spawn in the Soul Sand Valley biome in the Nether.
Drops: Lost Souls
The Soulmass is a creature made of clumped together souls beyond recognition. It can be summoned by the Soul Reaper with at least 30 soul charges, and will protect the owner by using different spells. It can be right clicked to make them stationary on that position, summoning a soul circle above their head that heals it.
Attacks:
Drain: The Soulmass lasers a target with a soul beam, dealing damage and healing itself in the process.
Jaws: The Soulmass claps his hands together, summoning Evoker fangs.
Division: It slams the ground, releasing a portion of itself to summon 4 Familiar Ghosts to help fighting.
Last Resort: When killed, the Soulmass will gather all it's remaining strength and energy to unleash a devastating blast that damages, slows and weakens all hostile mobs in it's chunk.
Drops: Blaze powder
Entities of pure fire energy. They will either shoot fireballs at their target like a Blaze, or buff nearby allies with Strength, Regeneration, Resistance and Fire Resistance. They can be summoned by the Day Stalker to aid in her fight, meaning the spheres will apply buffs to hostile creatures.
Drops: Ice blocks and Soul Ingots.
Frozen, forgotten husks of ice. They are slow, but tanky beings that attack by slowly moving towards a target and slamming the ground, dealing AOE damage. Can only be summoned by using the Frostmourne after acquiring enough souls.
Drops: Blue ice blocks
Cold souls clinging on to a physical form. They will fly around, phasing through walls and shoot a cold storm of snow and ice at their target, dealing 2 damage each second tick (in total 10 damage each second) and apply Permafrost 3 at all targets hit. Additionally, all non-allied entities around the spectre will be affected with Permafrost 1 for 1 second. The spectre has only 10 health, but will only take 10% of the damage if it was not magic damage. Can only be summoned by using the Frostmourne after acquiring enough souls.
