How do you make a part move upwards if an npc's health is at 0?

Hi, to achieve this, you can constantly check if the npc's health is equal to zero and if so, you can tween to door to open.

Here's a script:

-- i made 2 bosses

local part1 = game.Workspace.Part1 -- get your 1st door
local part2 = game.Workspace.Part2 -- get your second door

local TweenService = game:GetService("TweenService") -- this is the tween for the 1st door

local part1 = game.Workspace.Part1 -- 1st door

local goal = {}
goal.Position = Vector3.new(-6.197, 22.353, -67.553) - set the position you want the door to be if it is killed.

local tweenInfo = TweenInfo.new(5) -- how long the door takes to fully open, keep it as 5 to make the tween smooth.

local tween1 = TweenService:Create(part1, tweenInfo, goal) -- give the information

local TweenService = game:GetService("TweenService") -- tween for the 2nd door

local part2 = game.Workspace.Part2 -- get your 2nd door

local goal = {}
goal.Position = Vector3.new(-23.852, 21.838, -66.892) -- set the position you want the door to be if it is killed.

local tweenInfo = TweenInfo.new(5) --how long the door takes to fully open, keep it as 5 to make the tween smooth.

local tween2 = TweenService:Create(part2, tweenInfo, goal) -- gives information

local npc1 = game.Workspace.NPC1 -- get your 1st boss
local npc2 = game.Workspace.NPC2 -- get your 2nd boss

while true do -- while true do constantly goes in a loop, therefore checking constantly if a boss is killed.
if npc1.Humanoid.Health == 0 then -- checks if 1st boss is killed
    tween1:play() -- plays the tween
end

if npc2.Humanoid.Health == 0 then -- checks if 2nd boss is killed
    tween2:play() -- plays the tween
    end
    wait() -- keeps from destroying your pc and intense lag
end

Hope this helped!

Any questions? just ask!