Drop Item Script (inside NPC)

local dropChance = 20 -- out of 100, 0 being no chance, 100 being every time
local npc = script.Parent
local toDrop = script.ItemName -- what item the script gives npc's killer
local human = npc.Humanoid

-------------------------------------------------------

function giveItem(p)
    local chance = math.random(1,100)
    if chance <= dropChance then
        print("NPC died, dropped " ..toDrop.Name.. " which was picked up by " ..p.Name)
        local c = toDrop:Clone()
        c.Parent = p.StarterGear
    else
        print("NPC died, did not drop anything")
    end
end

human.Died:connect(function()
    local tag = human:FindFirstChild("killer")
    if tag then
        local p = tag.Value
        if p then
            giveItem(p)
        end
    end
end)