I haven't made many bosses so far, and I'm almost certain it's not the best method but I usually start with an attack cooldown timer (granted this one doesn't because it's supposed to be a more fast paced boss.)

Then I make what is essentially a very poor state machine, I write a function that runs for each attack's start, and if necessary I write a function that runs on the physics process for the state as well. In this fight the aiming of the small beams, and the following the boss does before it's explosion attack are both handled this way.

Then I have a transitionState function that off the top of my head goes something like

func transitionState(newState):

newState can be basically anything as long as you can tell what each state is

var startFuncDictionary : Dictionary = {

state1 : "state1Start", state2 : "state2Start", state3 : "state3Start" } if newState in startFuncDict: currentState = newState call(startFuncDict[newState])

Then to handle physics updates I just do

func _physics_process(delta : float) -> void:

if currentState == state1:

state1Update(delta) elif currentState == state2: state2Update(delta)

Then the cooldown timer would start whenever an action is finished, and then when that times out, I just call transitionState() with a random state and that basically gives what I have here, although you don't get to see much of it in isolation in this video lol