Fireball, need to tweak the animation to get some grey at the end like the standing fire

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game/scenes/Projectiles/fireball.gd

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+extends Area3D
+
+@export var initial_speed := 24.0
+@export var minimum_speed := 4.0
+@export var deceleration := 9.0
+@export var lifetime := 3.0
+
+var _direction := Vector3.FORWARD
+var _speed := initial_speed
+var _age := 0.0
+
+
+func launch(origin: Vector3, direction: Vector3) -> void:
+	global_position = origin
+	if direction.length() > 0.0001:
+		_direction = direction.normalized()
+		look_at(global_position + _direction, Vector3.UP)
+	_speed = initial_speed
+
+
+func _ready() -> void:
+	body_entered.connect(_on_body_entered)
+	area_entered.connect(_on_area_entered)
+
+
+func _physics_process(delta: float) -> void:
+	_age += delta
+	if _age >= lifetime:
+		queue_free()
+		return
+
+	global_position += _direction * _speed * delta
+	_speed = move_toward(_speed, minimum_speed, deceleration * delta)
+
+
+func _on_body_entered(_body: Node3D) -> void:
+	queue_free()
+
+
+func _on_area_entered(_area: Area3D) -> void:
+	queue_free()

game/scenes/Projectiles/fireball.gd.uid

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+uid://bm0h12cdnatgh

game/scenes/Projectiles/fireball.tscn

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+[gd_scene format=3 uid="uid://cnqyidky3strc"]
+
+[ext_resource type="Script" uid="uid://bm0h12cdnatgh" path="res://scenes/Projectiles/fireball.gd" id="1_fireball_script"]
+[ext_resource type="Texture2D" uid="uid://b2dmnrm3ubjon" path="res://assets/textures/stolenFire.png" id="2_fire_texture"]
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_fireball"]
+radius = 0.35
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_fireball"]
+transparency = 1
+cull_mode = 2
+albedo_color = Color(1, 0.48, 0.12, 1)
+albedo_texture = ExtResource("2_fire_texture")
+emission_enabled = true
+emission = Color(1, 0.32, 0.08, 1)
+emission_energy_multiplier = 3.0
+billboard_mode = 1
+
+[sub_resource type="SphereMesh" id="SphereMesh_fireball"]
+material = SubResource("StandardMaterial3D_fireball")
+radius = 0.35
+height = 0.7
+radial_segments = 32
+rings = 16
+
+[sub_resource type="Curve" id="Curve_fireball_alpha"]
+_data = [Vector2(0, 0), 0.0, 0.0, 0, 0, Vector2(0.2, 1), 0.0, 0.0, 0, 0, Vector2(1, 0), 0.0, 0.0, 0, 0]
+point_count = 3
+
+[sub_resource type="CurveTexture" id="CurveTexture_fireball_alpha"]
+curve = SubResource("Curve_fireball_alpha")
+
+[sub_resource type="Gradient" id="Gradient_mhwgj"]
+offsets = PackedFloat32Array(0, 0.45, 0.78, 1)
+colors = PackedColorArray(1, 0.95, 0.55, 1, 1, 0.29, 0.05, 1, 0.42, 0.42, 0.42, 0.75, 0.16, 0.16, 0.16, 0)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_fireball"]
+gradient = SubResource("Gradient_mhwgj")
+
+[sub_resource type="Curve" id="Curve_fireball_scale"]
+_data = [Vector2(0, 0.35), 0.0, 0.0, 0, 0, Vector2(0.35, 1), 0.0, 0.0, 0, 0, Vector2(1, 0.15), 0.0, 0.0, 0, 0]
+point_count = 3
+
+[sub_resource type="CurveTexture" id="CurveTexture_fireball_scale"]
+curve = SubResource("Curve_fireball_scale")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_fireball"]
+emission_shape = 1
+emission_sphere_radius = 0.25
+angle_min = -180.0
+angle_max = 180.0
+direction = Vector3(0, 0, 1)
+spread = 180.0
+initial_velocity_min = 0.3
+initial_velocity_max = 1.8
+gravity = Vector3(0, 1.5, 0)
+scale_min = 0.35
+scale_max = 0.9
+scale_curve = SubResource("CurveTexture_fireball_scale")
+color = Color(1, 0.47, 0.12, 1)
+color_ramp = SubResource("GradientTexture1D_fireball")
+alpha_curve = SubResource("CurveTexture_fireball_alpha")
+
+[sub_resource type="QuadMesh" id="QuadMesh_fireball_particle"]
+material = SubResource("StandardMaterial3D_fireball")
+size = Vector2(0.75, 0.75)
+
+[node name="Fireball" type="Area3D" unique_id=1503468252]
+collision_layer = 8
+collision_mask = 7
+monitorable = false
+script = ExtResource("1_fireball_script")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="." unique_id=1304632772]
+shape = SubResource("SphereShape3D_fireball")
+
+[node name="Core" type="MeshInstance3D" parent="." unique_id=1406426055]
+mesh = SubResource("SphereMesh_fireball")
+
+[node name="Glow" type="OmniLight3D" parent="." unique_id=844333466]
+light_color = Color(1, 0.42, 0.12, 1)
+light_energy = 2.5
+
+[node name="Trail" type="GPUParticles3D" parent="." unique_id=890543085]
+amount = 36
+lifetime = 0.45
+preprocess = 0.2
+process_material = SubResource("ParticleProcessMaterial_fireball")
+draw_pass_1 = SubResource("QuadMesh_fireball_particle")