Regular Bone Machetes last one trip into Blighted Grove, while exceptionally crafted ones last 2 trips.
http://www.uoguide.com/Bone_Machete
The durability of bone machetes is very low; they often are destroyed in the passage into the Grove.
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Player-made acid proof rope also has chance of being destroyed on entry and the blessed quest version can also be destroyed on entry despite having a timer.
http://www.uoguide.com/Acid_Proof_Rope
http://www.uoguide.com/Bone_Machete
The durability of bone machetes is very low; they often are destroyed in the passage into the Grove.
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Player-made acid proof rope also has chance of being destroyed on entry and the blessed quest version can also be destroyed on entry despite having a timer.
http://www.uoguide.com/Acid_Proof_Rope
They have a chance to be destroyed when the Palace is entered. If it is not destroyed, a message is displayed saying the rope was weakened by the acid. These messages appear to have no real effect on the ropes themselves, as some ropes will last for several trips into the Palace even though they are supposedly weakened each time, while other ropes are destroyed on their first use.