Effect by Rubo

-- Delta Compatible Aura Script
local Player = game.Players.LocalPlayer
local Character = Player.Character or Player.CharacterAdded:Wait()
local HumanoidRootPart = Character:WaitForChild("HumanoidRootPart")

-- Settings
local AuraColor = Color3.fromRGB(0, 255, 255) -- Cyan (Change this to any color!)
local OrbitSpeed = 5
local AuraSize = Vector3.new(4, 0.2, 4)

-- Create the Aura Part
local Aura = Instance.new("Part")
Aura.Name = "DeltaAura"
Aura.Parent = Character
Aura.Shape = Enum.PartType.Cylinder
-- We use a Cylinder rotated to look like a ring
Aura.Orientation = Vector3.new(0, 0, 90) 
Aura.Size = AuraSize
Aura.Color = AuraColor
Aura.Material = Enum.Material.Neon
Aura.CanCollide = false
Aura.Anchored = false
Aura.Transparency = 0.5

-- Add a glow effect
local Attachment = Instance.new("Attachment", Aura)
local Particles = Instance.new("ParticleEmitter", Attachment)
Particles.Rate = 20
Particles.Speed = NumberRange.new(0)
Particles.LightEmission = 1
Particles.Color = ColorSequence.new(AuraColor)
Particles.Size = NumberSequence.new(0.5, 0)

-- Weld it so it stays with you
local Weld = Instance.new("Weld")
Weld.Part0 = HumanoidRootPart
Weld.Part1 = Aura
Weld.C0 = CFrame.new(0, -2.5, 0) -- Position at feet
Weld.Parent = Aura