Limbo is a puppet, a mindless and souless one. The driver of these puppets is
The Operator, not because he's connected to these puppets, but because he holds the "controler" (i'll simplify this as much as i can) to control the movements of these puppets. If this puppet does get "speared" the puppet goes bye bye ofc. But
The Operator can create as much of these as he wants. Think of an engennier who can build cars. He can build as many as he wants, and no matter what happens to the cars the enennier will not be affected, the cars will go bye bye, others will pop up.
That's the whole idea. So the spear will work (obviously), it's just that it won't end the fight as more clones will pop up. Get the point?
But both you and monarch just said that throwing the spear will come way later on.
Limbo has: Non-Lethal Hax (Incap win conditions) and time travel to counter immortalities and glads (assuming glads never goes out, which according to monarch it will go out), which is what the limbo votes are based upon.