Lost Soul

Lost Souls are mystical glowing hostile mobs that spawn in the outer End islands. Their body shape is suspiciously similar to that of a player.

Spawning
Lost Souls can spawn out of an Enderman in the outer End islands with a range of 101 through 128 (you can learn more about the spawning system in "More Mobs" here). You can learn more about how Endermen spawn here.

You can also summon a Lost Soul using this command: /function imm:summon/imm/lost_soul. You can obtain a Lost Soul Spawn Frame with this command: /function imm:spawn_frame/imm/lost_soul. Make sure to replace the 'imm' portion with whatever version you're playing on if your version is older than Snapshot 3C (example: Snapshot 2A = imm2a).

General
Lost Souls will pursue players, Villagers, Wandering Traders, Iron Golems and baby Turtles on sight from 40 blocks away, as opposed to 16 blocks in most other hostile mobs. They will attempt to avoid obstacles, including sheer cliffs, water and lava, and will try to find the shortest path towards their target. If the Lost Soul is attacked by another mob it will attack it in return.

The Lost Soul is technically an undead mob, but will not drown. However, it will stomp Turtle Eggs and sink in water.

Transforming
If a Lost Soul spawns inside of an End City, it converts into a Shulker with a bizarre sound. The Shulker is white and glows briefly producing a sparkling particle effect. Its only difference from other Shulkers is the color.

Fighting strategies
At this stage of the game players should be prepared for fighting Lost Souls. It's easy for a group of Lost Souls to form while you're fighting one, but if you keep your distance and have a strong weapon on you it shouldn't be a tough fight. Additionally you can just try the pillar trick.

Drops
As with all mystical mobs, the Lost Soul has to be killed by a player to drop:
 * 1 Corrupted Soul
 * 5 experience

Data values
Lost Souls possess the same tags as all zombies, but they spawn with a set of additional stats. Click hereto see the data values common to all zombies.
 * Health: 70
 * Tags: iMM, iMMEnder, iMMGI, iMM_LostSoul
 * Silent: 1b
 * CustomName: {"translate":"imm.entity.lost_soul"} (§fLostSoul in English US)
 * CustomNameVisible: 0
 * DeathLootTable: imm:entities/imm/mystical
 * CanPickupLoot: 1b
 * Attributes:
 * generic.maxHealth: 70
 * generic.knockbackResistance: 0.75
 * generic.attackDamage: 7
 * generic.movementSpeed: 0.25
 * generic.followRange: 30
 * zombie.spawnReinforcements: 0

Advancements
The Lost Soul can be required (as the Zombie) for the following advancements (all of which are form vanilla Minecraft):
 * Adventure
 * Monster Hunter

The Lost Soul is also required to be killed for the following "More Mobs" advancements: There's also a "More Mobs" advancement that is granted for killing a Lost Soul that turned into a Shulker:
 * Monsters Hunted
 * Monster Fighter
 * Mob Fighter
 * Shulker Farming Solution #44466

Metahistory
Lost Souls existed in an old unreleased version of "More Mobs" for the End. It functioned pretty much the same as the current version of the mob, except it didn't turn into Shulkers in End Cities.

Known issues
There are currently no known issues with this mob in the latest release.