Crystal saw

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The Crystal saw is an item made from a small crystal seed by invoking the singing bowl in Brimstail's cave in the Tree Gnome Stronghold. A seed is awarded to players who complete The Eyes of Glouphrie quest.

The saw adds a hidden +3 bonus to the player's Construction skill. This allows the player to construct items as if their Construction level was higher by 3, although this advantage isn't applicable when constructing things that don't require a saw, such as monsters, plants, or rooms. This bonus is stackable with drinking the teas and stews that already boost this skill.

However, once the saw has been used to construct 28 items, it reverts to its seed form where it will need to be re-enchanted by returning to Brimstail's cave.

Trying to conserve charges when building something you already have the Construction level for by having a normal saw in your inventory at the same time does not work, even if the normal saw is ahead of the Crystal Saw in your inventory. Each item still takes away one charge of your saw even if you already had the level necessary to build it.

Trivia
It was once possible to obtain multiple Crystal Saws when The Path of Glouphrie was released. The Crystal Seeds properties were the same as The Eyes of Glouphrie's crystal seed. You could use the seed to create another Crystal Saw in Brimstails cave. After you used the seed Brimstail would give you another seed, with a conversation claiming that you 'lost' the seed. This could be repeated multiple times. However Jagex removed this glitch a few weeks after the quests release.