Mob File

Acromantula:
  Type: SPIDER
  Display: '&fAcromantula - [&6LvL &a<caster.level>&f]'
  Health: 20
  Damage: 3
  AIGoalSelectors:
  - 0 clear
  - 1 meleeattack
  - 2 randomstroll
  AITargetSelectors:
  - 0 clear
  - 1 players
  LevelModifiers:
    Health: 2
    Damage: 0.1
  Drops:
  - AcromantulaDrops
  Options:
    MovementSpeed: 0.3
  DamageModifiers:
  - LIGHTNING 0
  - FIRE 0.5
  Skills:
  - skill{s=RandomLevelTrigger} @self ~OnSpawn 1