-- Check if "powerkiller" already exists and is valid, and if so, kill it
if powerkiller and IsValidEntity(powerkiller) then
    powerkiller:Remove()
end

-- Create a new entity of class "move_rope" and store it in the "powerkiller" reference
powerkiller = Entities:CreateByClassname("move_rope")
powerkiller:Spawn()

-- Define the KillPowerups function to remove all powerup runes
function KillPowerups()
    local rune = Entities:FindByClassname(nil, "item_powerup_rune")
    while rune do
        rune:Remove()
        rune = Entities:FindByClassname(nil, "item_powerup_rune")
    end

    -- Return -1 to run this function every game tick
    return -1
end

-- Make it a think function to run every game tick
powerkiller:SetContextThink("KillPowerups", KillPowerups, 0)