Example configs

Tested to be working as of fe49ad3

Slime jumping attack

slime:
  x: 280
  "y": 4
  z: 280
  world: FLAT
  networkId: minecraft:slime
  movesByJumping: true
  drops: slimeball;0;1; slimeball;0;1;;50 slimeball;0;1;;50 # drops 1-3 slimeballs
  speed: 0.5
  gravity: 0.01
  jumpStrength: 3
  scale: 5
  attackDamage: 5
  range: 50
  hurtModifiers:
    4: 0 #no fall damage

Creeper blast

creeper:
  x: 270
  "y": 4
  z: 270
  world: FLAT
  networkId: minecraft:creeper
  drops: gunpowder;0;1;;50
  attackDamage: 0
  range: 50
  speed: 0.5
  projectiles:
  - fireRangeMin: 0
    fireRangeMax: 2
    speed: 1
    attackRate: 10
    attackDamage: 0
    explodeRadius: 5
    explodeDestroyBlocks: false
    health: 5
    canBeAttacked: false
    despawnAfter: 20
    gravity: 0
    particle: minecraft:endrod

Guardian laser

guardian:
  x: 290
  "y": 4
  z: 290
  world: FLAT
  networkId: minecraft:guardian
  movesByJumping: true
  jumpStrength: 1
  speed: 0.5
  drops: fish
  gravity: 0.01
  attackDamage: 5 # melee
  scale: 2
  range: 50
  armor: # for thorns, will not show
  - minecraft:diamond_helmet;0;1;{ench:[{id:5s,lvl:5s}]}
  projectiles: # actual laser damage
  - fireRangeMin: 0
    fireRangeMax: 20
    speed: 10
    attackRate: 100
    attackDamage: 1
    health: 5
    canBeAttacked: false
    followNearest: true # 100% hit unless behind a block
    despawnAfter: 100
    gravity: 0
    particle: minecraft:endrod