Game Mode: OSRS(Idk if this is still a thing in RS3, I only play OS)
Link to wiki: Chompy Hunting WiKi
Summary: Walk to the south Chompy Spot:
Fill your bellows, use the bellows on a toad, place the toad in the hunting area, and wait for a chompy.
Required stats: 30+ Ranged.
Required quests...