Kill Aura

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local LocalPlayer = Players.LocalPlayer

local Remote = ReplicatedStorage
    :WaitForChild("RemoteEvents")
    :WaitForChild("Combat")
    :WaitForChild("HitHumanoid")

local Levels = {"Low","High"}

local MAX_DISTANCE = 20
local MAX_DISTANCE_SQ = MAX_DISTANCE * MAX_DISTANCE

local enemies = {}

local function characterReady()
    local character = LocalPlayer.Character
    if not character then return false end

    local humanoid = character:FindFirstChildOfClass("Humanoid")
    local root = character:FindFirstChild("HumanoidRootPart")

    if not humanoid or not root then
        return false
    end

    if humanoid.Health <= 0 then
        return false
    end

    return true
end

local function getWeapon(character)
    for _, v in ipairs(character:GetChildren()) do
        if v:IsA("Tool") then
            return v
        end
    end
end

local function getRoot(model)
    return model:FindFirstChild("HumanoidRootPart")
        or model:FindFirstChild("UpperTorso")
        or model:FindFirstChild("Torso")
        or model.PrimaryPart
end

local function trackModel(model)

    if Players:GetPlayerFromCharacter(model) then
        return
    end

    task.spawn(function()

        local humanoid = model:FindFirstChildOfClass("Humanoid") or model:WaitForChild("Humanoid",2)
        local root = getRoot(model)

        if not root then
            root = model:WaitForChild("HumanoidRootPart",2)
        end

        if humanoid and root then
            enemies[model] = {
                humanoid = humanoid,
                root = root
            }

            humanoid.HealthChanged:Connect(function(h)
                if h <= 0 then
                    enemies[model] = nil
                end
            end)

            model.AncestryChanged:Connect(function(_, parent)
                if not parent then
                    enemies[model] = nil
                end
            end)
        end

    end)
end

local function scan(container)

    for _, v in ipairs(container:GetDescendants()) do
        if v:IsA("Model") then
            trackModel(v)
        end
    end

    container.DescendantAdded:Connect(function(obj)
        if obj:IsA("Model") then
            trackModel(obj)
        end
    end)
end

scan(workspace)

while true do
    task.wait(0.15)

    if not characterReady() then
        continue
    end

    if next(enemies) == nil then
        continue
    end

    local Character = LocalPlayer.Character
    local Root = Character.HumanoidRootPart
    local Weapon = getWeapon(Character)

    if not Weapon then
        continue
    end

    for model,data in pairs(enemies) do

        local humanoid = data.humanoid
        local enemyRoot = data.root

        if not humanoid or humanoid.Health <= 0 or not enemyRoot then
            enemies[model] = nil
            continue
        end

        local diff = enemyRoot.Position - Root.Position

        if diff:Dot(diff) <= MAX_DISTANCE_SQ then
            Remote:FireServer(
                Weapon,
                humanoid,
                Levels[math.random(1,2)]
            )
        end

    end
end