Scroll of proficiency
 | |
| Scroll of proficiency | |
|---|---|
| Release | 27 May 2014 (Update) |
| Members | Yes |
| Quest item | No |
| Properties | |
| Tradeable | No |
| Equipable | No |
| Stackable | No |
| Disassembly | No |
| Destroy | Drop |
| Values | |
| Value | 25,000 coins |
| Alchemy | Not alchemisable |
| On death | Reclaimable Reclaim: 3,000 Sacrifice: 12,000 |
| Weight | 0.025 kg |
| Examine | |
| Secrets of Construction lie within. | |
| Advanced data | |
| Item ID | 31451 |
| Links | MRID • recipe |
| FAQ • doc | |
The scroll of proficiency requires a Construction level of 60 and a Dungeoneering level of 60. Reading the scroll of proficiency permanently unlocks the ability: when constructing a piece of furniture that requires three planks or more, there is a chance that you will retain one or more planks. The chances are:
- 50% for normal planks
- 25% for oak planks
- 20% for teak planks
- 10% for mahogany planks
- 5% for protean planks
It is not possible to obtain multiple scrolls or to buy a scroll if the player has previously unlocked the scroll's ability.
When read, you get the message: The secret is yours! You unlock the ability to save planks when constructing. and when you save a plank you get the message: Your proficient construction ability means you retain [amount] plank[s].
Analysis[edit | edit source]
The scroll of proficiency rolls to save a plank for every third plank used in an item. This means it can save up to 1 plank in items that use 3-5 planks, 2 planks in items that use 6-8, and 3 in items using 9-11.
The chances and average savings are as such:
| Plank | 3-5 plank items | 6-8 plank items | 9-11 plank items | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Save: | 0 | 1 | Avg | 0 | 1 | 2 | Avg | 0 | 1 | 2 | 3 | Avg |
| Normal | 50% | 50% | 0.5 | 25% | 50% | 25% | 1 | 12.5% | 37.5% | 37.5% | 12.5% | 1.5 |
| Oak | 75% | 25% | 0.25 | 56.25% | 37.5% | 6.25% | 0.5 | 42.19% | 42.19% | 14.06% | 1.56% | 0.75 |
| Teak | 80% | 20% | 0.2 | 64% | 32% | 4% | 0.4 | 51.2% | 38.4% | 9.6% | 0.8% | 0.6 |
| Mahogany | 90% | 10% | 0.1 | 81% | 18% | 1% | 0.2 | 72.9% | 24.3% | 2.7% | 0.1% | 0.3 |
| Protean | 95% | 5% | 0.05 | 90.25% | 9.5% | 0.25% | 0.1 | 85.74% | 13.54% | 0.71% | 0.01% | 0.15 |
Because the scroll rolls with equal chance for every third plank, it increases efficiency the most when constructing items that use 3, 6, or 9 planks. Constructing items with different numbers of planks adds planks without adding an extra chance to save, resulting in decreased efficiency, as shown below.
The expected percentages of planks saved are as follows:
| Plank | Number of planks | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | |
| Normal | 0% | 0% | 16.67% | 12.5% | 10% | 16.67% | 14.29% | 12.5% | 16.67% | 15% | 13.64% |
| Oak | 0% | 0% | 8.33% | 6.25% | 5% | 8.33% | 7.14% | 6.25% | 8.33% | 7.5% | 6.82% |
| Teak | 0% | 0% | 6.67% | 5% | 4% | 6.67% | 5.71% | 5% | 6.67% | 6% | 5.45% |
| Mahogany | 0% | 0% | 3.33% | 2.5% | 2% | 3.33% | 2.86% | 2.5% | 3.33% | 3% | 2.73% |
| Protean | 0% | 0% | 1.67% | 1.25% | 1% | 1.67% | 1.4% | 1.25% | 1.67% | 1.5% | 1.36% |
Store locations[edit | edit source]
| Seller | Location | Cost | Currency | Base stock | Members? |
|---|---|---|---|---|---|
| Rewards trader | Daemonheim, • Daemonheim, Land of Snow (2010) • Lumbridge Crater (2013) | 20,000 |  Dungeoneering tokens | 1 |  |
| Wythien | Prifddinas | 20,000 | Dungeoneering tokens | 1 | |
| Chaotic equipment | |||||||||
| Gravite weaponry | |||||||||
| Necklaces |
| ||||||||
| Other Ranged equipment | |||||||||
| Other Magic equipment | |||||||||
| Prayer | |||||||||
| Skill scrolls | |||||||||
| Pets | |||||||||
| Miscellaneous | |||||||||
| Removed | |||||||||
