How do I make NPCS defend you from hostile mobs?

Hello, you can use something like this:

local goodMob = goodmobLocation -- past here defending mob location

local badMob = badMobLocation -- past here bad mob location

local players = game:GetService("Players")


while wait() do -- infinite checking loop
    for i, v in pairs(players:GetChildren()) do
        local char = v:WaitForChild("Character")
        local hrp = char:WaitForChild("HumanoidRootPart")

        if (badMob.Position - hrp.Position).magnitude < 100 then  -- if badMob is less then 100 stoods away from player
            goodMob.Humanoid:MoveTo(badMob) -- this may be wrong, I dont have a lot of experience with MoveTo, you can use pathfinding service
        end
    end
end

Here are some sources that you may find useful:

PathfindingService This can be used to help locate the hostile mobs. Locate their positions and chase after them.

Remember to equip your NPCs with weapons!

Magnitude This can be used to locate the nearest mob.

I've never tried clone simulator, but I think you clone the NPCs to help defend you? if so, check out Clone

If you want your NPCs to have animations, check out How to make Animations in Roblox Studio!