Example Mob:
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WinterCrestBoss:
  Mobtype: Stray
  Health: 1000
  Display: "&3&lWinter&8&lCrest"
  Armor: 3
  Damage: 15
  Options:
    AlwaysShowName: true
    FollowRange: 64
    KnockbackResistance: 0.75
    MaxCombatDistance: 25
    NoDamageTicks: 5
    MovementSpeed: 0.39
    PreventItemPickup: true
    PreventRandomEquipment: true
    PreventOtherDrops: true
  BossBar:
    Enabled: true
    Title: ''
    Range: 64
    Style: SEGMENTED_12
    Color: PINK
  Skills:
  - skill{s=WinterSRandom} @trigger ~onAttack
  - skill{s=WinterRandom} @PIR{r=30} ~onTimer:150
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Example Skills:
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WinterSRandom:
  Cooldown: 10
  Skills:
  - randomskill{s=WinterSwipe,GreatForceStrike}
WinterRandom:
  Cooldown: 10
  Skills:
  - randomskill{s=WinterRain,WinterAxeThrow,WinterSnowball}
WinterRain:
  Cooldown: 15
  Conditions:
  - hastag{tag=casting} false
  Skills:
  - addtag{tag=casting} @self
  - message{m="&7[<mob.name>&7] &3May the heavens raise hell on Earth!"} @PIR{r=40}
  - potion{type=SLOW;l=14;d=200} @self
  - potion{type=DAMAGE_RESISTANCE;l=9;d=200} @self
  - delay 60
  - effect:particlering{particle=snowball;a=30;r=4;points=12;repeat=20;repeatInterval=2} @self
  - skill{s=WinterRainMeteor;repeat=8;repeatInterval=30} @PIR{r=30;limit=1;sort=RANDOM}
  - removetag{tag=casting} @self
WinterRainMeteor:
  Skills:
  - projectile{onTick=WinterRM-Tick;onHit=WinterRM-Hit;onEnd=WinterRM-End;Interval=1;Type=METEOR;HeightFromSurface=14;Gravity=1.7;Velocity=8;HorizontalRadius=1.5;HorizontalOffset=45;VerticalOffset=45}
WinterRM-Tick:
  Skills:
  - blockmask{material=packed_ice;r=2;onlyair=true;duration=2;shape=sphere;noair=true} @origin
  - effect:particles{p=snowball;hSpread=1.25;vSpread=1.8;a=160} @origin
WinterRM-Hit:
  Skills:
  >>>> - damage{a=10;preventImmunity=true} <<<<
  - potion{type=BLINDNESS;l=9;d=100;force=true}
  - potion{type=SLOW;l=2;d=100;force=true}
WinterAxeThrow:
  TargetConditions:
  - distance{d=>5}
  - gamemode{
  Conditions:
  - hastag{tag=casting} false
  Skills:
  - addtag{tag=casting} false
  - message{m="&7[<mob.name>&7] &3Go... my Axe."} @PIR{r=30}
  - potion{type=SLOW;l=4;d=100;force=true} @self
  - delay 60
  - projectile{bulletType=ITEM;material=DIAMOND_AXE;onTick=WinterAxe-Tick;onHit=WinterAxe-Hit;onEnd=WinterAxe-End;Interval=1;MaxRange=30;HitNonPlayers=true;Velocity=12}
  - removetag{tag=casting} false
WinterAxe-Tick:
  Skills:
  - effect:particles{particle=snowball;a=5;hSpread=0.15;vSpread=0.05;speed=0.1}
WinterAxe-Hit:
  Skills:
  >>>> - damage{a=20;pi=true;pkb=true} <<<<
  - effect:particles{p=snowball;a=80;hSpread=0.5;vSpread=0.25;useEyeLocation=true;speed=0.2}
  - potion{type=SLOW;l=2;d=100}
  - delay 10
  - teleport{spreadh=0;spreadv=0}
  - skill{s=GreatForceStrike}
  - settarget_ext{event=true}
WinterAxe-End:
  Skills:
  - teleport
WinterSnowball:
  Conditions:
  - hastag{tag=casting} false
  Skills:
  - addtag{tag=casting} @self
  - message{m="&7[<mob.name>&7] &3You will all feel the wrath of Winter's Crest!"} @PIR{R=30}
  - potion{type=SLOW;l=4;d=200} @self
  - delay 80
  - skill{s=SnowballThrow;repeat=3;repeatInterval=20} @PIR{r=30}
  - removetag{tag=casting} @self
SnowballThrow:
  Skills:
  - effect:sound{sound=entity.egg.throw}
  >>>> - shoot{type=snowball;damage=8;onTick=ST-Tick;velocity=0.5;interval=1} <<<<
ST-Tick:
  Skills:
  - effect:particles{p=snowball;a=2} @origin