Slender Man has a chance to spawn in any forest biome at night. He has 3 different phases that change his aggression and behavior. Slender Man natrually progresses through these phases along side the player when they progress in their world.
If you want to know everything there is to know about this data pack, watch my showcase video here:
[SPOILERS] Complete feature list:
In a new world all players start with slender difficulty 0:
Slender difficulty phase 0:
custom model (regular one)
custom sound
random spawn chance if player in any type of forest at night
stalks player and disappears if looked at
After obtaining iron armor achievement, difficulty phase is raised to 1
random spawn chance if player in any type of forest at night (a bit higher chance than phase 0 slender)
spawns way closer to player, jumpscares the player that way
blinds player and then vanishes
After obtaining diamond armor achievement, difficulty phase is raised to 2
Slender difficulty phase 2:
difficulty of the world must be easy or higher, because slender is a hostile mob
random chance that boss fight encounter starts if player is in any type of forest at night
1 out of 8 random warning messages appears in chat
creepy theme music starts and gets more intense until slender spawns
slender spawns and the fight begins:
during the whole fight, an intense slender theme plays
player has darkness effect applied
black smoke envelopes the player and slender
slender moves slowly towards the player to damage them
slender’s attacks apply wither effect
slender has a random chance to teleport around the player during the fight
slender has a random chance to teleport the player around himself during the fight
slender will teleport if the player was close enough to him for more than 3 seconds (so the fight lasts longer)
if the player dies or runs away, slender despawns and a grace period is applied (slender cant spawn for the rest of the current night)
if the player kills slender, he will drop 1 out of 8 random pages and the grace period is applied (slender cant spawn for the rest of the current night)
Players can throw pages into fire or lava to burn them:
a custom sound will play
the current number of pages that have been burnt is shown in chat
if 8/8 pages are burned, a creepy sound plays and slender is banished from the world
slender cannot spawn in the world anymore if he is banished
This is the “end” of the data pack and its progression