My suggestion to improve the current hunt system:

The hunt master in each zone will now sell a unique untradeable item called "Hunting License" specific for that zone - costing 300 myths. This license entitles you to kill a single B, A, and S mob in that zone. If you do not possess this license or have already killed the specific-rank mob on your current license, you cannot even attack the target. If you want to hunt the mobs in that zone again, you will need to purchase another license. You must purchase a license for each zone you want to hunt in.

"Reset" of mob can only occur if the mob has not been attacked for 10 seconds. HP reset will not occur as long as at least one eligible person is attacking it.