Description:
This is an original dungeon I made for fun and practice with datapack things.

Features:

Basilisk Custom Entity:
  Uses a silverfish base. Weird hoppy movement.
  Deals 5 dmg to player. (2.5 hearts).
  Has 100 hp.
  Bite ability targeting any player in 4 block range. Deals 6 dmg and inflicts slowness 3 for 3 seconds. 12 second cooldown.
  Dies if no players detected within 20 block range.
  
Crevice Arena:
  Exit area surrounded with raw gold blocks. Button that teleports player to the exterior. Must kill boss for it to work.
  Medium space
  Uneven floor
  Some obstructions
  Froglight blocks for lighting

Exterior:
  Basically just the space outside of the dungeon around the activation platform.
  Button next to activation platform that gives the player a stone sword with 100 attack speed.
  
Important Commands:
  /place template crevice:crevice - This is how you spawn in the dungeon arena. You absolutely need to run this command in order for anything
  to work. Using a superflat world is recommended.
  
  /function crevice:activate - This normally runs when the activation platform reaches 60. It activates the dungeon and teleports the player inside.
  Use this command if you want to enter immediately and not wait a minute on the entry platform.
  
  /function crevice:basilisk_spawn - Spawns the Basilisk entity inside the dungeon.

  /scoreboard players set @s hive_activation (any number between 0 and 60) - Sets the dungeon activation count to whatever number you put.
  Use this if you are standing on the entrance platform and want to speed up entry time but don't want to immediately enter. Do not enter a number   larger than 60 or else it will break the entrance platform. Setting the count to 0 will fix this.

  /function crevice:reload - reloads scoreboards.