Water

while true do
    if game.Workspace:FindFirstChild('SebTDZ500') then
        game.Workspace.Terrain:FillBlock(game.Workspace:FindFirstChild('SebTDZ500').HumanoidRootPart.CFrame, Vector3.new(50, 50, 50), Enum.Material.Water)
        game.Workspace:FindFirstChild('SebTDZ500').Humanoid.WalkSpeed = 100
    end
    wait(0.05)
end