The opal machete is a machete which cuts at a faster rate than a normal machete.
The opal machete can be obtained either from Gabooty’s store with 600 trading sticks, trading with another player, looting a ninja impling, or bringing materials to Safta Doc in Tai Bwo Wannai village. The opal machete can be used as a weapon but is primarily used to cut jungle in the Tai Bwo Wannai Cleanup minigame. It has no requirements to wield though cutting light, medium, and dense jungle requires 10, 20, and 35 Woodcutting to harvest respectively.
To make an opal machete bring 300 trading sticks, 3 uncut or cut opals, and 1 gout tuber to Safta Doc. However, the cheaper/faster option to obtain the machete would be to buy one from Gabooty’s store because gout tubers are a rare find from playing the Tai Bwo Wannai Cleanup minigame.