An actual thing that could work here would be to adjust its HP dynamically with the amount of people attacking it. Example: 1 person attacking it = base HP, 2 person = Base HP x 1.5 and so on to a certain cap. Like this, it would give a chance for people that starts The Hunt later in the game after the initial excitement dwindles to stand a chance against them and for the people right now to actually have a chance at the claim.