MOB:
AttackMM:
  Type: WITHER_SKELETON
  Display: "Hi"
  Health: 500
  Modules:
    ThreatTable: true
  Skills:
  - setvariable{var=IsMythic;value=1;type=INTEGER;scope=CASTER;save=true} @self ~onSpawn
  - skill:CheckIfMM @EIR{r=15;sort=NEAREST;ignore=samefaction} ~onTimer:20
  - threat{a=100} @PIR{r=15} ~onTimer:20
TEST MOB:
RandomMM:
  Type: Pig
  Skills:
  - setvariable{var=IsMythic;value=1;type=INTEGER;scope=CASTER;save=true} @self ~onSpawn

SKILL:
CheckIfMM:
  TargetConditions:
  - variableisset target.IsMythic true
  Skills:
  - threat{a=100}