Crystal hatchet

The Crystal hatchet is the most powerful hatchet available. It can be obtained in Prifddinas by trading in a dragon hatchet, from either the inventory or the toolbelt, and 4,000 harmonic dust to Lady Ithell, in the Ithell Clan district of Prifddinas. 70 Attack is required to wield it, and 71 Woodcutting to chop with it. It chops roughly 15% faster than the dragon hatchet.

The Crystal hatchet can be added to the toolbelt, and does not degrade like other crystal items. It features an improved woodcutting speed compared to a dragon hatchet and players using it have twice the chance to gain Shattered Heart and golden Shattered Heart rocks. Players may convert their crystal hatchet back to a dragon hatchet by speaking to Lady Ithell, however they will not be given back the harmonic dust previously used to upgrade the tool.

The crystal hatchet has a special attack, Clobber, which requires 100% adrenaline and lowers your opponent's Defence and Magic by 10% while dealing 25%-150% damage.

Trivia

 * While the hatchet has a woodcutting requirement of level 71, it can only be obtained in Prifddinas, which is only accessible after finishing Plague's End. This quest itself has Within the Light as a prerequisite, which has a woodcutting requirement of level 75 that cannot be boosted.
 * Given a rate of 600 dust per hour at the harps, obtaining the crystal hatchet is worth it if you would spend 51 hours or more chopping trees normally. Considerering you would also get a decent amount of crafting xp with the harps it's probably worth to get it.